Adjusted means and percentage differences in height, weight and ponderal index by NS-SEC and ethnic group.

Mean: means adjusted for sex, age, observer, month and school (random effect). 95% CI: 95% confidence interval of the mean. ¶Estimates adjusted for ethnicity (all groups included). ‡interaction test of NS-SEC and main ethnic groups (white European, black African-Caribbean, South Asian) and excluding “unclassified” NS-SEC group fitting NS-SEC as an ordinal variable. §interaction test of NS-SEC and main ethnic groups (white European, black African-Caribbean, South Asian) and excluding “unclassified” NS-SEC group fitting NS-SEC as a categorical variable. †per NS-SEC decrement from professional to economically inactive (excluding unclassified group). €per NS-SEC decrement from professional to routine &manual (excluding economically inactive and unclassified groups). *p-value for NS-SEC fitted as an unordered nominal variable (excluding unclassified group). Note: Percentage variance due to school differences: height 0.3%, weight 0.9%, ponderal index 1.3%.