Maternal Education & Child Care:       Two way ANOVA           Source: Babu and Sanyal (2009)   1
Child Malnutrition• Causes:  Inadequate food, health, lack of sanitation facilities,   high fertility rates, ignorance ab...
Importance of Mother’s Education• Caldwell (1979): Education of women played an  important role in determining child survi...
Issue• Policy and program formulation:    How various determinants of child malnutrition     contribute independently and...
Method: Two-way ANOVA• Verify impact of maternal education and child-care on  children’s nutritional status as measured by...
Conceptual Framework      Maternal Education & Child Care   6
Conceptual Framework• Better educated women:    Knowledgeable about health care    If exposed to new information, assimi...
Conceptual and measurement issues on             child-care             Maternal Education & Child Care   8
Conceptual and measurement issues            on child-care• Child survival, nutrition and health = f(household  food secur...
Conceptual and measurement issues            on child-careCare (Engle et al., 1999):1. Care for pregnant and lactating wom...
Conceptual and measurement issues            on child-careResources for care:1. Education, knowledge, and beliefs2. Health...
Measurement issues•   Care = time spent (quantity of care) and the nature of the activities undertaken    (quality of care...
Empirical Analysis• Interface of maternal education, child care and child• The two-way ANOVA: Determines if there are over...
Analysis• Educational level effect:• H0: mean weight for height Z-scores do not differ by  educational levels of the mothe...
Analysis• Care effect:• H0 : mean weight for height Z-scores do not differ by  care levels by the mother.• H01: mean weigh...
Analysis• Interaction effect:• H0 : there is no interaction between educational  levels and care levels.• H1: there is an ...
Data Description• Dependent variable: weight for height Z-  scores, which is a measure of short-term child  nutritional st...
Data Description• Education of the spouse (EDUCSPOUS):  A categorical variable, the value of which ranges   from 1 to 7. ...
Data Description• Child-care index (CARE):    F(variables related to child-feeding practices (such as     breastfeeding a...
Table 7.1 Prevalence of stunting by          mothers’ educational level                                                 ZH...
Prevalence of stunting by mother’s         education level No marked differences in the prevalence of stunting  between n...
Table 7.2 Prevalence of wasting by        mothers’ educational level                                                   ZWH...
Prevalence of wasting by mothers’        educational level Significant differences in the prevalence of wasting between  ...
Two-way ANOVA results• Three different statistical tests:1. Main effect of educational level of the spouse.2. Main effect ...
Definition of main effect• This is the effect of one independent variable on the  dependent variable across the levels of ...
Table 7.3 Effect of mothers’ education on                 ZWHNEW EDUCSPOUS                                                ...
Effect of mothers’ education on ZWHNEW• Mean performance on weight for height Z-  scores is greater for mothers with some ...
Table 7.4 Effect of child-care on ZWHNEW          NCARE                                     Mean            1             ...
Effect of child-care on ZWHNEW  Mean weight for height Z-scores is highest for   mothers in the medium care tercile (0.97...
Variance partitioning for two-way ANOVA              Maternal Education & Child Care   30
Between Sum of Squares• SSB = Squares of mothers’ educational level  SS (EDUCSPOUS) + Sum of squares of terciles  of child...
Sum of Square of the Interaction Term             Maternal Education & Child Care   32
Two-way ANOVA model     Maternal Education & Child Care   33
Two-way ANOVA model•   The left-hand side of equation (7.5) is the total sum of    squares, while the right hand side cons...
Table 7.5 ANOVA table for an a*b factorial               experimentSource               SS                             df ...
ANOVA Results• Main effect of mothers’ education on weight for  height Z-score: F-value = 4.085 (p-value = 0.008)• Reject ...
ANOVA Results• Main effect of child-care terciles on weight  for height Z-score: F-value = 3.056 (p = 0.049)• Reject the n...
Table 7.6 Tests of between subject effects:       dependent variable ZWHNEW                  Type III sum of        Source...
Interaction effect and post-hoc tests• Issue: There are more than two means; which means (if any) are  significantly diffe...
Results• Mothers with more education relative to mothers with no  education practice greater child-care.• The simple post-...
Table 7.7 Multiple comparison test                                       EDUCSPOUS                                      No...
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Topic 14 maternal education

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Topic 14 maternal education

  1. 1. Maternal Education & Child Care: Two way ANOVA Source: Babu and Sanyal (2009) 1
  2. 2. Child Malnutrition• Causes: Inadequate food, health, lack of sanitation facilities, high fertility rates, ignorance about child-care practices and lack of access to health services. Poor water, sanitation and hygiene account for 16 per cent of deaths of children under 5 globally WHO (2005). Understanding the causes and context of malnutrition is important in devising strategies that generate better child health and nutritional outcomes. Maternal Education & Child Care 2
  3. 3. Importance of Mother’s Education• Caldwell (1979): Education of women played an important role in determining child survival even after controlling for other socioeconomic characteristics.• Mother’s education can enhance child survival : Implementation of health knowledge, an increased capability to interact in the modern world and greater control over health choices for her children. Maternal Education & Child Care 3
  4. 4. Issue• Policy and program formulation:  How various determinants of child malnutrition contribute independently and interact with each other in determining the final outcomes.  Formal education of the mother may increase the care practices through knowledge.  Educated mothers are also time constrained due to their participation in labor markets and illiterate care-givers may have time but may have indigenous (or primitive) child survival practices.  Understanding the interaction of such related variables has been a policy and programmatic challenge since such interactions are usually cultural and context specific. Maternal Education & Child Care 4
  5. 5. Method: Two-way ANOVA• Verify impact of maternal education and child-care on children’s nutritional status as measured by height for age (HAZ) and weight for height (WHZ) Z-scores, using a two- way ANOVA approach.• Advantage: Permits verification of “interaction effect”, simultaneous assessment of the effects of two (or more) independent variables on a single dependent variable and the possible combined effects of the independent variables on the dependent variable.• Current Context: Effect of one factor (for example, maternal education) depends on the level of the second factor (child-care). Maternal Education & Child Care 5
  6. 6. Conceptual Framework Maternal Education & Child Care 6
  7. 7. Conceptual Framework• Better educated women:  Knowledgeable about health care  If exposed to new information, assimilate this improved knowledge into better care practices than women with lesser education; become aware of health services (such as health center facilities and availability of doctors) and generate additional nutritional knowledge (such as immunization of children against diseases, taking appropriate actions on incidence of infant diarrhea, feeding the child during sickness and breastfeeding during early childhood).  Such good care practices can, in turn, improve the nutritional status of children.  Better health care practices are especially relevant for less educated mothers, for mothers with more dependents and for children from households with limited resources, poor housing conditions and lack of access to hygiene and sanitation services. Maternal Education & Child Care 7
  8. 8. Conceptual and measurement issues on child-care Maternal Education & Child Care 8
  9. 9. Conceptual and measurement issues on child-care• Child survival, nutrition and health = f(household food security, a healthy environment, available health services, care provided to women and children).• Care = ‘the provision in the household and the community of time, attention and support to meet the physical, mental, and social needs of the growing child and other household members’. Maternal Education & Child Care 9
  10. 10. Conceptual and measurement issues on child-careCare (Engle et al., 1999):1. Care for pregnant and lactating women2. Breastfeeding and complementary feeding of young children3. Food preparation and food storage behaviors4. Hygiene behaviors5. Care for children during illness Maternal Education & Child Care 10
  11. 11. Conceptual and measurement issues on child-careResources for care:1. Education, knowledge, and beliefs2. Health and nutritional status of the care-giver3. Mental health, lack of stress, and self- confidence of the care-giver4. Control of resources and intrahousehold allocation5. Workload and time constraints6. Social support from family members and the community. Maternal Education & Child Care 11
  12. 12. Measurement issues• Care = time spent (quantity of care) and the nature of the activities undertaken (quality of care).• ‘time spent on care’ method: Time spent in specific activities with children (such as bathing, feeding, etc.) along with other activities of the household. Most of the studies do not find any significant association between child-care time and nutritional status; may not be a good indicator of nutritional status.• ‘quality of care’ approach: Determines how specific practices lead to better nutritional outcomes for children; classified into caregiver and psychosocial care practices – former affects child’s nutrient intake through psychomotor capabilities (such as use of finger foods, spoon handling ability, etc.) and appetite (Engle et al., 1999).• Additionally, the care-giver’s ability to feed responsively may include encouraging the child to eat, offering additional foods, responding to poor appetite and using a positive style of interaction with the child.• Some studies in developing countries have also found a strong association between specific feeding behaviors (such as location of feeding, organization of feeding event) with mothers’ educational status (Guldan et al., 1993). Psychosocial care, on the other hand, refers to the provision of affection and warmth, responsiveness to the child and the encouragement of autonomy and exploration (Engle et al., 1999). Culture plays a central role in psychosocial care. Maternal Education & Child Care 12
  13. 13. Empirical Analysis• Interface of maternal education, child care and child• The two-way ANOVA: Determines if there are overall differences in weight for height Z-scores (ZWH) between different educational levels of the mother, between varying levels of child-care and whether there is an interaction effect of educational level and child-care on improving child nutritional status .• The interaction effect can be thought of as saying that the effect of one factor (e.g. educational level) depends on the level of the second factor (e.g. child-care). For example, it may be the case that higher educated women provide better child-care than lower educated women. Maternal Education & Child Care 13
  14. 14. Analysis• Educational level effect:• H0: mean weight for height Z-scores do not differ by educational levels of the mother.• H1: mean weight for height Z-scores differ by educational levels of the mother. Maternal Education & Child Care 14
  15. 15. Analysis• Care effect:• H0 : mean weight for height Z-scores do not differ by care levels by the mother.• H01: mean weight for height Z-scores differ by care levels by the mother. Maternal Education & Child Care 15
  16. 16. Analysis• Interaction effect:• H0 : there is no interaction between educational levels and care levels.• H1: there is an interaction between educational levels and care levels. Maternal Education & Child Care 16
  17. 17. Data Description• Dependent variable: weight for height Z- scores, which is a measure of short-term child nutritional status.• Define a transformation such that: ZWHNEW = 1 if ZWH ≥ -2 (normal Z scores) and = 0 if ZWH < -2 (low Z scores). Value of 1 indicates no wasting, while a value of 0 indicates wasting. Maternal Education & Child Care 17
  18. 18. Data Description• Education of the spouse (EDUCSPOUS): A categorical variable, the value of which ranges from 1 to 7. Measures the education level of the spouse (or mother) in number of years. (In the case of female- headed households in the two-way ANOVA analysis, we separate out females who are heads of the household and thus are not the spouse of a male- headed household.) For example, the variable attains a value of 5 if the spouse completed secondary education. Higher values indicate more number of years in schooling. Maternal Education & Child Care 18
  19. 19. Data Description• Child-care index (CARE):  F(variables related to child-feeding practices (such as breastfeeding and feeding the child during sickness) and preventive health seeking behavior (whether the child was immunized).  The index ranged on a continuous scale from -1 to +1, with -1 denoting poor child-care practices and +1 denoting good care practices.  For age groups where a particular practice (such as breastfeeding for children above 24 months of age and compulsory immunization to children below 9 months) is not likely to improve the growth of children, the component was assigned a value of 0 implying a neutral effect. The index was made age specific for each age group. Maternal Education & Child Care 19
  20. 20. Table 7.1 Prevalence of stunting by mothers’ educational level ZHANEW Low Normal Total No education 41 50 91 Adult literacy 1 6 7EDUCSPOUS Std 1–4 14 19 33 Std 5–8 24 29 53 Total 80 104 184 =n Maternal Education & Child Care 20
  21. 21. Prevalence of stunting by mother’s education level No marked differences in the prevalence of stunting between non-educated and educated women. For example, for mothers with no education, the prevalence of stunting is 51.3 per cent relative to the presence of normal children of 48.1 per cent. For some level of educational attainment of the mother (std 5–8) which in this sample is the highest educational attainment, the prevalence of stunting is 30 per cent relative to no prevalence (or normal children) of only 27.9 per cent. The p value is 0.457 and, as the significance level is greater than 0.1, the null hypothesis cannot be rejected at the 10 per cent level. Thus, we can conclude that there is no significant difference in prevalence of stunting between educated and non-educated mothers. Maternal Education & Child Care 21
  22. 22. Table 7.2 Prevalence of wasting by mothers’ educational level ZWHNEW Low Normal Total No education 15 84 99 78.90% 47.50% Adult literacy 2 5 7 10.50% 2.80%EDUCSPOUS Std 1–4 0 35 35 0.00% 19.80% Std 5–8 2 53 55 10.50% 29.90% Total 19 177 196=n Maternal Education & Child Care 22
  23. 23. Prevalence of wasting by mothers’ educational level Significant differences in the prevalence of wasting between non-educated and educated women. For mothers with no education, the prevalence of wasting is almost 79 per cent compared to non-prevalence (47.5 per cent). Thus, it would appear that short-term nutritional status is significantly influenced by mothers’ educational level. As educational level increases, there is much less prevalence of wasting. P value from the Pearson chi-square statistic is 0.006 and since it is less than 0.1, the null hypothesis that there is no difference between wasting among uneducated and educated mothers can be rejected. Educational level matters for short-term nutritional status. In the next section, we investigate the role of mothers’ education and child-care on weight for height Z-scores using a two-way ANOVA approach. Maternal Education & Child Care 23
  24. 24. Two-way ANOVA results• Three different statistical tests:1. Main effect of educational level of the spouse.2. Main effect of care levels by terciles of care.3. Interaction effects between educational level of the spouse and care levels. Maternal Education & Child Care 24
  25. 25. Definition of main effect• This is the effect of one independent variable on the dependent variable across the levels of the other independent variable.• Issue:• Verify if there is a difference in the mean weight for height Z-scores by the educational levels of the mother averaging over the child-care levels. In other words, ignoring the effect of child-care levels, do weight for height Z-scores differ between educated and non-educated mothers?• Verify if there is a difference in weight for height Z-scores by child-care terciles ignoring the educational levels of the mother. One way to understand the main effect is to examine the marginal means. Maternal Education & Child Care 25
  26. 26. Table 7.3 Effect of mothers’ education on ZWHNEW EDUCSPOUS Mean No education 0.844 Adult literacy training 0.75 Std 1–4 1 Std 5–8 0.961 Maternal Education & Child Care 26
  27. 27. Effect of mothers’ education on ZWHNEW• Mean performance on weight for height Z- scores is greater for mothers with some educational level relative to mothers with no education.• Do the marginal means differ? Maternal Education & Child Care 27
  28. 28. Table 7.4 Effect of child-care on ZWHNEW NCARE Mean 1 0.842 2 0.974 3 0.884 Maternal Education & Child Care 28
  29. 29. Effect of child-care on ZWHNEW Mean weight for height Z-scores is highest for mothers in the medium care tercile (0.974) followed by the upper care tercile. As care behavior improves (such as breastfeeding children below 2 years of age), nutritional status of children improves after controlling for educational level of the mother.• Issue: If the marginal means among the various child-care terciles differ• Ans: Calculate the sum of squares. Maternal Education & Child Care 29
  30. 30. Variance partitioning for two-way ANOVA Maternal Education & Child Care 30
  31. 31. Between Sum of Squares• SSB = Squares of mothers’ educational level SS (EDUCSPOUS) + Sum of squares of terciles of child-care SS (NCARE) + Sum of squares of the interaction SS (interaction). Maternal Education & Child Care 31
  32. 32. Sum of Square of the Interaction Term Maternal Education & Child Care 32
  33. 33. Two-way ANOVA model Maternal Education & Child Care 33
  34. 34. Two-way ANOVA model• The left-hand side of equation (7.5) is the total sum of squares, while the right hand side consists of SSB and SSW.• The first three terms on the right hand are the sum of squares of factor A, factor B and the interaction term, while the last expression denotes the sum of squares of the error term or the sum of squares within.• After dividing the relevant expressions by the degrees of freedom, we obtain the mean square expressions.• The corresponding F ratios are obtained by dividing the mean square of factor A, factor B and the interaction term (A*B) by the mean square error. Maternal Education & Child Care 34
  35. 35. Table 7.5 ANOVA table for an a*b factorial experimentSource SS df MSFactor A SS(A) (a-1) MS(A) =SS(A)/(a 1)Factor B SS(B) (b-1) MS(B) = SS(B)/(b 1) MS(AB) = SS(AB)/(a -1)(b -Interaction AB SS(AB) (a-1)(b-1) 1)Error SSW (N-ab) SSW/(N -ab)Total (corrected) TSS (N-1) Maternal Education & Child Care 35
  36. 36. ANOVA Results• Main effect of mothers’ education on weight for height Z-score: F-value = 4.085 (p-value = 0.008)• Reject null hypothesis that mean weight for height Z-scores do not differ by educational levels of the mother. Thus, education of the mother has a significant influence on weight for height Z-scores.• Inference: There is a significant difference in the mean weight for height Z-scores between educated and non-educated mothers ignoring the impact of child-care. Maternal Education & Child Care 36
  37. 37. ANOVA Results• Main effect of child-care terciles on weight for height Z-score: F-value = 3.056 (p = 0.049)• Reject the null hypothesis that the mean weight for height Z-scores do not differ by care levels of the mother and thus child-care levels have a significant impact on weight for height Z-scores after ignoring the impact of mothers’ education. Maternal Education & Child Care 37
  38. 38. Table 7.6 Tests of between subject effects: dependent variable ZWHNEW Type III sum of Source df Mean square F P value squaresSSB 2.187 10 0.218 2.691 0.003Intercept 64.330 1 64.330 798.914 0.000EDUCSPOUS 0.987 3 0.329 4.085 0.008NCARE 0.492 2 0.246 3.056 0.049EDUCSPOUS*NCARE 0.708 6 0.118 1.468 0.202SSW 14.971 185 0.081TSS 17.158 195 R squared = 0.132 (adjusted R squared = 0.085). Maternal Education & Child Care 38
  39. 39. Interaction effect and post-hoc tests• Issue: There are more than two means; which means (if any) are significantly different.• Four educational levels of the mother and three child-care levels.• Table 7.6: Overall interaction effect (EDUCSPOUS*NCARE) is not significant.• Still there may be significant differences among the means of mothers’ educational levels and child-care, i.e., there may be differences among combinations of education levels and child- care terciles.• Post-hoc tests are used when the researcher is exploring differences among group means, otherwise the likelihood of type 1 errors increases.• Illustration with reference to educational level of the mother and childcare terciles. Maternal Education & Child Care 39
  40. 40. Results• Mothers with more education relative to mothers with no education practice greater child-care.• The simple post-hoc analysis compares a given pair of means. If they are significantly different (p < 0.05), different letters are placed next to these means to indicate that they are significantly different.• For the same level of child-care, higher education among mothers (elementary schooling) improves short-term nutritional status as measured by weight for height Z-scores.• For a given level of education (no education or some elementary schooling), mothers in the second child-care tercile perform better than ones in the highest care tercile = Impact of positive child-care practices improves short-term nutritional status for households in the lower socioeconomic terciles compared to the upper socioeconomic terciles. Maternal Education & Child Care 40
  41. 41. Table 7.7 Multiple comparison test EDUCSPOUS No education Std 1–4NCARE 2 0.929 a 1.00 b 3 0.735 c 1.00 d Maternal Education & Child Care 41
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