Table 1

 Descriptive statistics for children split by gender and ethnic origin

GirlsBoysp value†
WhiteAsianWhiteAsian
Numbers represent means with standard deviation in brackets.
*Values standardised for gender and age.
†ANOVA p values for differences between groups.
Sample size (range)42–49103–11642–4469–85
Age (years)9.60 (1.34)8.99 (1.50)9.04 (1.33)8.83 (1.47)
Standing height (m)1.37 (0.10)1.33 (0.11)1.34 (0.09)1.33 (0.10)0.050
Standing height z score*0.20 (0.89)0.07 (1.09)0.16 (0.94)0.10 (1.21)0.89
Weight (kg)35.2 (8.2)30.6 (8.6)33.3 (8.7)31.1 (9.7)0.012
Weight z score*0.49 (0.98)0.04 (1.12)0.65 (1.04)0.24 (1.47)0.021
BMI (kg/m2)18.4 (3.1)17.0 (2.9)18.3 (3.3)17.3 (3.2)0.011
BMI z score*0.51 (1.16)0.006 (1.2)0.79 (1.17)0.30 (1.44)0.0032
Chest circumference (cm)66.8 (6.2)64.2 (7. 7)67.6 (6.6)65.3 (7.9)
Chest height (cm)23.9 (2.6)23.0 (2.5)23.9 (2.1)23.6 (2.3)
Transverse diameter (cm)19.6 (1.5)18.8 (1.9)20.3 (1.6)19.5 (2.0)
A–P diameter (cm)13.8 (1.25)13.1 (1.5)14.2 (1.4)13.6 (1.6)
Chest size as a box (l)6.58 (1.51)5.76 (1.71)7.00 (1.66)6.39 (1.95)
Chest size as cylinder (l)8.65 (2.32)7.79 (2.64)8.88 (2.40)8.27 (2.88)
FVC (l)2.19 (0.39)1.80 (0.41)2.19 (0.38)1.89 (0.43)
FEV1 (l)1.96 (0.35)1.68 (0.36)1.93 (0.32)1.69 (0.36)
PEF (l/s)4.22 (0.87)3.83 (0.88)4.12 (0.90)3.87 (0.93)
FEF75–25 (l/s)2.23 (0.57)2.09 (0.59)2.10 (0.62)1.91 (0.57)