Table 1.

Study, Sample and Test Characteristics.

No. of Administrations	Level	Characteristic	M	SD	Mdn	Min	Max	% NA
2	Study (m = 36)	year of publication	2010.00	4.13	2012.00	1999.00	2016.00	0.00
		no. of administrations	3.028	1.96	2.00	2.00	12.00	0.00
		TR interval (weeks)	32.89	75.32	3.00	0.00	312.90	0.00
		% control groups	36.73					0.00
	Sample (k = 49)	N	445.10	2755.30	25.00	9.00	19,330	0.00
		age	51.70	19.74	54.50	14.8	68.80	0.00
		% male	41.31	17.65	45.50	0.00	100.00	12.25
	Test (o = 128)	% alternate test forms	3.18					1.56
		SMCR1.2	−0.22	0.28	−0.19	−1.19	0.46	0.00
		SE(SMCR1.2)	0.17	0.06	0.16	0.01	0.31	0.00
3	Study (m = 14)	year of publication	2008.00	4.05	2008.00	1999.00	2014.00	0.00
		no. of administrations	4.64	2.40	4.00	3.00	12.00	0.00
		TR interval (weeks)	4.53	5.84	2.14	0.00	17.43	0.00
		% control groups	12.00					0.00
	Sample (k = 25)	N	34.36	22.67	25.00	10.00	113.00	0.00
		age	31.16	17.21	22.20	15.41	67.35	0.00
		% male	39.63	19.37	33.63	0.00	100.00	12.00
	Test (o = 58)	% alternate test forms	3.57					3.44
		SMCR1.3	−0.40	0.48	−0.27	−1.85	0.35	0.00
		SE(SMCR1.3)	0.17	0.06	0.16	0.08	0.34	0.00
4	Study (m = 9)	year of publication	2007.00	4.11	2007.00	1999.00	2013.00	0.00
		no. of administrations	5.56	2.60	5.00	4.00	12.00	0.00
		TR interval (weeks)	4.38	6.71	0.51	0.00	20.00	0.00
		% control groups	14.29					0.00
	Sample (k = 14)	N	34.36	27.79	24.00	10.00	113.00	0.00
		age	34.97	18.58	23.00	15.41	63.68	0.00
		% male	40.58	13.20	41.18	0.00	60.00	7.14
	Test (o = 26)	% alternate test forms	8.33					7.69
		SMCR1.4	−0.57	0.50	−0.55	−1.85	0.33	0.00
		SE(SMCR1.4)	0.17	0.08	0.16	0.08	0.39	0.00

Note. SE(SMCR) = $\sqrt{Var\left(SMCR\right)}$.