Gender differences in the distribution of children’s physical activity: evidence from nine countries

Table 3 Association between gender and moderate to vigorous activity as defined by Evenson cut points

Gender	N (%)	NO distribution		BCCG distribution
Gender	N (%)	Mean % Difference (SE)	SD % Difference (SE)	Median % Difference (SE)	Skewness^b
Girls (ref) Unadjusted	7998 (51.7)	42.94	23.80	39.64	0.56
Boys (Unadjusted Difference)	7463 (48.3)	37.64 (0.86)***	29.50 (1.13)***	39.76 (0.98)***	0.08 (0.02)**
Boys^a (Adjusted Difference)	7463 (48.3)	37.70 (0.79)***	30.25 (1.14)***	40.49 (0.92)***	0.08 (0.02)***

BCCG Box-Cox Cole and Green distribution, SD Standard deviation, GAMLSS Generalized Additive Models for Location, Scale and Shape, SE Standard error
^* = p < 0.05, ** = p < 0.01, *** = p < 0.001
Differences in mean, variability and skewness estimated by GAMLSS,
^aAdjusted for parental education, BMI, and country. NO: normal distribution
^bSkewness is estimated as the Box-Cox power (that is, the power required to transform the outcome to a normal distribution, values closer to 1 represent less skew)

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