Child gender	Child age	Mean	Standard deviation	Correlation
Child gender	Child age	Mean	Standard deviation	8	10	12	14
Girls	8	22.1	1.9		0.88	0.86	0.84
	10	23.4	2.1			0.90	0.89
	12	24.6	2.3				0.92
	14	25.7	2.6
Boys	8	22.1	2.5		0.56	0.57	0.57
	10	23.4	2.6			0.61	0.62
	12	24.6	2.8				0.66
	14	25.7	3.0