Adjusted means and percentage differences in skinfolds, fat mass index and waist circumference by NSSEC and ethnic group.

Mean: means adjusted for sex, age, observer, month and school (random effect). Missing values: sum of skinfolds (n = 12), fat mass index (n = 64), waist circumference (n = 1).
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: sum of skinfolds 1.5%, fat mas index 3.5%, waist circumference 0.9%.