Table 1.

Percentage of adequate initial antiretroviral prescriptions according to prevailing guidelines.

	N	Until 2000	N	After 2001	P value*
		% (n)		% (n)
IMSS	63	75 (47)	146	38 (56)	0.00
SSA	15	100 (15)	90	72 (65)	0.02
INS	101	94 (95)	86	79 (68)	0.02
P value**		0.001		0.00

*P value of differences between periods in each subsystem.

**P value of differences between periods for all facilities.