Table 2.

Descriptive statistics for dependent variables

APT (N = 7274)			TS (N = 7274)			Cited by Clin. (N = 7274)
Mean ± SD	Median (IQR)	Range	Mean ± SD	Median (IQR)	Range	Mean ± SD	Median (IQR)	Range
0.24 ± 0.26	0.05 (0.05–0.25)	0.05–0.95	0.24 ± 0.21	0.19 (0.06–0.36)	0.00–1.00	0.59 ± 2.40	0.00 (0.00–0.00)	0.00–64.00

Valid values	Frequency	%	Valid values	Frequency	%	Valid values	Frequency	%
APT = 0.05	3769	51.8	TS ≤ 0.05	1627	22.4	0	5821	80.0
APT = 0.25	1794	24.7	0.05 < TS ≤ 0.25	2826	38.9	1	740	10.2
APT = 0.50	778	10.7	0.25 < TS ≤ 0.50	1973	27.1	2	270	3.7
APT = 0.75	742	10.2	0.50 < TS ≤ 0.75	678	9.3	3	146	2.0
APT = 0.95	191	2.6	0.75 < TS ≤ 0.95	101	1.4	4	88	1.2
			0.95 < TS ≤ 1.00	69	0.9	5–6	83	1.1
						7–8	47	0.7
						9–23	63	0.9
						≧24	16	0.2