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

Table 4 Association between gender and sedentary behaviour 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	7377 (52.2)	365.86	99.39	359.64	0.54
Boys (Unadjusted Difference)	6763 (47.8)	-5.01 (0.46)***	-1.34 (1.19)	-5.15 (0.51)***	0.01 (0.05)
Boys^a (Adjusted Difference)	6091 (47.8)	-5.04 (0.44)***	-1.58 (1.19)	-5.18 (0.458***	-0.01 (0.05)

BCCG Box-Cox Cole and Green distribution, SD Standard deviation, CoV Coefficient of variation, 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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