<p>Mean: means adjusted for sex, age, observer, month and school (random effect).</p><p>95% CI: 95% confidence interval of the mean.</p>¶<p>Estimates adjusted for ethnicity (all groups included).</p>‡<p>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.</p>§<p>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.</p>†<p>per NS-SEC decrement from professional to economically inactive (excluding unclassified group).</p>€<p>per NS-SEC decrement from professional to routine &manual (excluding economically inactive and unclassified groups).</p>*<p>p-value for NS-SEC fitted as an unordered nominal variable (excluding unclassified group).</p><p>Note: Percentage variance due to school differences: height 0.3%, weight 0.9%, ponderal index 1.3%.</p
