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

Table 2 Association between gender and physical activity as measured by counts per minute

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)	532.91	200.32	513.31	0.48
Boys (Unadjusted Difference)	6763 (47.8)	19.85 (0.62)***	16.42 (1.26)***	21.29 (0.67)***	0.19 (0.03)***
Boys^a (Adjusted Difference)	6763 (47.8)	19.74 (0.58)***	17.24 (1.19)***	21.14 (0.63)***	0.17 (0.03)***

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)

ISSN: 1479-5868