This document provides information about puberty stages in boys and tools for assessing growth. It describes the three puberty stages as: pre-puberty (Tanner stage 1), puberty (Tanner stages 2-3), and completing puberty (Tanner stages 4-5). Signs for each stage include voice changes and development of pubic/armpit hair and genitals. The document also includes charts and tools to plot growth measurements, predict adult height, calculate BMI, and assess growth against a mid-parental target.

1. Pre-puberty In Puberty Completing Puberty
(Tanner stage 1) (Tanner stages 2-3) (Tanner stages 4-5)
If both of the following: If any of the following: If any of the following:
High voice Slight deepening of the voice Voice fully broken
No signs of pubertal Early pubic or armpit Moustache and early facial
development hair growth hair growth
Enlargement of testes or penis Adult size of penis with
pubic and axillary hair
Manufacture
4
Jan.
13
UK2-18A4B
Issue
2
Harlow
Printing
Limited
Tel:
0191
455
4286
www.healthforallchildren.co.uk
Data Recording
Recording Date
Weight
Length/Height
Location
Health worker name
Measurement 1
Measurement 2
Recording Date
Weight
Length/Height
Location
Health worker name
Recording Date
Weight
Length/Height
Location
Health worker name
Measurement 3
Measurement 4
Recording Date
Weight
Length/Height
Location
Health worker name
Recording Date
Weight
Length/Height
Location
Health worker name
Measurement 5
Measurement 6
Recording Date
Weight
Length/Height
Location
Health worker name
Recording Date
Weight
Length/Height
Location
Health worker name
Measurement 7
Measurement 8
Recording Date
Weight
Length/Height
Location
Health worker name
Recording Date
Weight
Length/Height
Location
Health worker name
Measurement 9
Measurement 10
Recording Date
Weight
Length/Height
Location
Health worker name
Very Overweight (Obese)
Overweight
99.6
98
91
75
50
25
9
2
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Adult Height Predictor
This allows you to predict the child’s adult height based on
their current height, but with a regression adjustment to
allow for the tendency of very tall and short children to be
less extreme in height as adults. Four boys out of five will
have an adult height within ±6 cm of the predicted adult
height.
Instructions for use
Plot the most recent height centile on the centile line on the
Adult Height Predictor (on the flap to the right of the height
centile chart) and read off the predicted adult height for this
centile.
Mid-Parental Centile
The ‘mid-parental centile’ is the average adult height centile
to be expected for all children of these parents. It
incorporates a regression adjustment to allow for the
tendency of very tall and short parents to have children with
less extreme heights. Comparing this to the child’s current
height centile can help assess whether the child’s growth is
proceeding as expected. The larger the discrepancy between
the two, the more likely it is that the child has some sort of
growth disorder. Most children’s height centiles (nine out of
ten) are within ±two centile spaces of the mid-parental
centile, and only 1 percent will be more than three centile
spaces below.
Instructions for use
The Mid-parental Centile Comparator is on the flap to the
right of the height centile chart. If possible measure both
parents’ heights, or else use reported heights. Plot their
heights on the Mother’s and Father’s height scales. Join the
two points with a line between them. The mid-parental
centile is where this line crosses the centile line in the middle.
Compare the mid-parental centile to the child’s current
height centile, plotted on the adult height predictor centile
scale.
Mid-parental target height
This can be obtained by plotting the mid-parental centile on
the main chart at age 18 and reading off the corresponding
height. Four boys out of five will have an adult height within
±7 cm of this target height. However the predicted adult
height (above) is usually closer than mid-parental target
height to the child’s final height.
Please place sticker (if available) otherwise write in space provided.
Name: ________________________________________
NHS/CHI No:
Hospital No:
Date of Birth:
BOYS
UK Growth chart
2-18 years
Anyone who measures a child, plots or interprets charts
should be suitably trained or supervised. For further
information and training materials see fact sheet and
presentation on www.growthcharts.rcpch.ac.uk
This chart is mainly intended to assess the growth of school
age boys. It combines data from the UK 1990 growth
reference for children at birth and from 4 -18 years(1), with
the WHO growth standard for children aged 2 years to 4
years(2). The growth of children under 2 years of age should
be plotted on the more detailed UK-WHO 0-4 years growth
charts.
As well as simply using this chart for plotting growth data, it
also includes a number of new features which you may wish
to use to help interpret the growth data.
• birth centile plotting scale
• BMI look-up and plotting grid
• scales to estimate adult height and mid-parental
centile
• guide to assessing puberty
Plotting
Plot each measurement by placing a small dot where a
vertical line through the child’s age crosses a horizontal line
through the measured value.
The lettering on the charts (‘weight’, ‘length’ etc.) sits on the
50th centile to provide orientation.
Birth centile plotting scale
The chart starts at age 2 years, but there is a plotting scale on
the left of the chart where for term infants, birth weight (and
if measured, length) can be plotted to allow comparison of
the birth centile with later growth.
months
months
Centile terminology
If the point is within 1/4 of a space of
the line they are on the centile: e.g. 91st.
If not they should be described as
being between the two centiles:
e.g. 75th–91st.
A centile space is the distance between
two of the centile lines, or equivalent
distance if midway between centiles.
Growth patterns before and during puberty
Successive height measurements can show wide variation,
because it is difficult to measure height accurately. If there are
concerns it is useful to measure on a few occasions over time.
Assessing growth during puberty is complex because the age
when puberty starts varies.
What does a height in the shaded area below the 0.4th
centile mean?
This chart provides some extra guidance about the lower limit
(0.4th centile) for height in boys 9-14 years. If a plot falls within
the shaded area on the height chart between 9 and 14 years,
pubertal assessment will be required and mid-parental centile
should be assessed.
If they are In puberty or Completing puberty, they are below
the 0.4th centile and should be referred. In most instances a Pre-
pubertal boy plotted in this area is growing normally, but
comparison with the mid-parental centile and growth trajectory
will assist the assessment of whether further investigation is
needed.
Pubertal Assessment
The puberty ‘phase’ may be ascertained through simple
questions about the appearance of secondary sexual
characteristics as well as by clinical examination.
By history from parents, carers or young person
Is the timing of puberty normal?
The three vertical black lines (puberty lines) on the right hand
page (9-18 years) of the chart indicate the normal age limits for
the phases of puberty described above.
• Boys with measurements plotted on the left page will
usually be in the ‘Pre-puberty’ phase. Puberty before 9
years in boys is likely to be precocious and further
assessment is necessary.
• Between 9-14 years most boys will be either ‘Pre- puberty’
or ‘In puberty’. If there are no signs of puberty by 14
years, then puberty is delayed and further assessment is
indicated.
• From 14-17 years most boys will be either ‘In puberty’ or
‘Completing puberty’.
• After 17 years boys will usually be ‘Completing puberty’.
If this is not the case, maturation is delayed and further
assessment may be needed.
If weight is above the 75th centile or if
weight and height centiles differ, the BMI
centile should be calculated, as the BMI
centile is the best indicator of thinness and
fatness. The BMI look-up allows you to read
off the BMI centile, accurate to a quarter of a
centile space. There is a BMI centile grid at
the top of the growth chart where the
centiles for children with high or low values
can be plotted.
Instructions for use
1. Note the weight and height centiles from
the growth chart.
2. Plot the weight centile against the height
centile on the the BMI look-up.
3. If between centiles, read across in this
position.
4. Read off the corresponding BMI centile
from the blue slanting lines.
5. Plot the centile in the BMI grid at the top
of the growth chart at the appropriate
age.
References
1. Freeman JV, Cole TJ, Chinn S, Jones PRM, White EM, Preece MA. Cross sectional stature and weight reference curves for the UK, 1990. Arch Dis Child 1995; 73:17-24.
2. www.who.int/childgrowth/en
For further relevant references see fact sheet downloadable from www.growthcharts.RCPCH.ac.uk
© Copyright RCPCH 2012
What does a high or low BMI mean?
A BMI above the 91st centile suggests overweight. A child above the 98th centile is very overweight (clinically obese). BMI below the
2nd centile is unusual and may reflect undernutrition, but may simply reflect a small build.
Body Mass Index (BMI) centile look-up
When is further assessment required?
If any of the following:
• Where weight or height or BMI is below the 0.4th
centile, unless already fully investigated at an earlier
age.
• If the height centile is more than 3 centile spaces below
the mid-parental centile.
• A drop in height centile position of more than 2 centile
spaces, as long as measurement error has been
excluded.
• Smaller centile falls or discrepancies between child’s
and mid-parental centile, if seen in combination, or if
associated with possible underlying disease.
• If there are any other concerns about the child’s
growth.
Measurement procedure
Accurate measurement is essential and shoes must be
removed for all measurements
Height:
Measure height recorded to the last
millimetre. A correctly installed
stadiometer or approved portable
measuring device is the only
equipment that can be reliably used
(see illustration). If a child cannot
stand, measure lying down, using
an approved length measuring
device and plot as for height.
Frankfurt
Plane
Position head
and feet as
illustrated with
child standing as
straight as
possible.
Weight:
Remove heavy clothing and shoes and
weigh using class III clinical electronic
scales in metric setting.

2. 99.6th
98th
91st
75th
50th
25th
9th
2nd
0.4th
200cm
195
190
185
180
175
170
165
160
155
150
145
140
135
130
125
120
115
110cm
80kg
75
70
65
60
55
50
45
40
35
30
25
20
15
10kg
weight
height
200cm
195
190
185
180
175
170
165
160
155
150
145
140
135cm
105kg
100
95
90
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10kg
height
weight
BOYS
10 11 12 13 14 15 16 17
Age in years
9-18 years
10
11 12 13 15 16
Puberty
starting
before
9
years
is
precocious
Puberty
starting
before
9
years
is
precocious
Puberty
is
delayed
if
no
signs
are
present
by
14
years
Puberty
completing
after
17
years
is
delayed
99.6th
98th
91st
75th
50th
25th
9th
2nd
0.4th
Pre-puberty 0.4th
99.6th
98th
91st
75th
50th
25th
9th
2nd
0.4th
99.6th
98th
91st
75th
50th
25th
9th
2nd
0.4th
155cm
150
145
140
135
130
125
120
115
110
105
100
95
90
85
80
75cm
20kg
15
10
5
0kg
155cm
150
145
140
135
130
125
120
115
110
105cm
50kg
45
40
35
30
25
20
15
10
5
0kg
BOYS
2
1
/2 3
1
/2 4
1
/2 5
1
/2 6
1
/2 7
1
/2 8 8
1
/2
3
2 4 5 6 7
Age in years
3
4 5 6 7
2
1
/
2
3
1
/
2 4
1
/
2 5
1
/
2 6
1
/
2 7
1
/
2
2-9 years
9
8 9
8
1
/
2
98th
91st
75th
50th
25th
9th
2nd
0.4th
99.6th
98th
91st
75th
50th
25th
9th
2nd
0.4th
Birth
centiles
Length
Weight
99.6th
9th
months
2nd
0.4th
25th
75th
50th
98th
91st
2
58
56
54
52
50
48
46
44cm
99.6th
0.4th
months
months
2nd
25th
9th
75th
50th
98th
91st
5
4.5
4
3.5
3
2.5
2kg
1
Puberty
is
delayed
if
no
signs
are
present
by
14
years
Puberty
completing
after
17
years
is
delayed
99.6th
98th
91st
75th
50th
25th
9th
2nd
0.4th
99.6th
9
8
t
h
91st
75th
50th
25th
9th
2nd
0.4th
99.6th
99.6th
98th
91st
75th
50th
25th
9th
2nd
0.4th
Parent Height Comparator
Adult Height Predictor
ft/in
6’3”
6’2”
6’1”
6’0”
5’11”
5’10”
5’9”
5’8”
5’7”
5’6”
5’5”
5’4”
5’3”
190
185
180
175
170
165
160
192
cm
99.6th
98th
91st
75th
50th
25th
9th
2nd
0.4th
ft/in cm
6’1”
6’
5’11”
5’10”
5’9”
5’8”
5’7”
5’6”
5’5”
5’4”
5’3”
5’2”
5’1”
5’
4’11”
4’10”
4’9”
Mother’s
height
185
180
175
170
165
160
155
150
145
ft/in
cm
6’7”
6’6”
6’5"
6’4”
6’3"
6’2"
6’1"
6’
5’11”
5’10”
5’9”
5’8”
5’7”
5’6”
5’5”
5’4”
5’3”
5’2”
5’1”
200
195
190
185
180
175
170
165
160
155
Father’s
height
Mid-parental
centile
91st
75th
50th
25th
9th
Predicted Adult Height
• Plot the most recent height
centile on the relevant centile
line and
• Read off the predicted adult
height for this centile.
• Four out of five children will
be within ±6 cm of this value.
Father’s height: ____________
Mother’s height: ___________
Mid-parental Centile
• Plot the the Mother’s and
Father’s heights on their
respective scales and join the
two points with a line. The
mid-parental centile is where
this line crosses the centile line
in the middle.
• Compare the mid-parental
centile to the child’s current
height centile, plotted on the
adult height predictor centile
scale.
• Nine out of ten children’s
height centiles are within
±two centile spaces of the
mid-parental centile.
For all Children
plotted in this
shaded area see
instructions.
99.6th
98th
91st
75th
50th
25th
9th
2nd
0.4th
99.6th
98th
91st
75th
50th
25th
9th
2nd
0.4th
BMI CENTILE FROM LOOKUP OVERLEAF
Very Overweight (obese)
Overweight
99.6th
98th
91st
75th
50th
25th
9th
2nd
0.4th
BMI CENTILE FROM LOOKUP OVERLEAF
Very Overweight (obese)
Overweight
17
14
Transit point
from UK-WHO
to UK90 data.
18
9 18