Table 1B.

Descriptive statistics of the confounding factors.

2010			2012
Confounding factors	♂ N = 125	♀ N = 124	Confounding factors	♂ N = 107	♀ N = 116
	% Median [IQR]			% Median [IQR]	% Median [IQR]
Age	8.00 [2.00]	8.40 [1.60]	Age	9.79 [2.30]	10.06 [2.20]
Body fat (%)	18 [6.17]	21 [9.85]	Body fat%	16 [7.60]	23 [8.78]
Mean heart rate (beats/min)	79 [13]	82 [9.71]	Mean heart rate (beats/min)	75 [15]	79 [14]
Negative emotions (0–30)	6.00 [8.00]	7.50 [7.00]	Negative emotions (0–30)	4.00 [6.00]	5.00 [7.00]
ses (low/high)	23.20% low 76.80% high	22.58% low 77.42% high	Tanner stadium (no signs/puberty signs)	76.64% no signs 23.36% puberty signs	66.38% no signs 33.62% puberty signs

♂, man; ♀, woman; N, number; [IQR], interquartile range; SES, socioeconomic status.