TABLE 4.

Stratum-specific likelihood ratio (SSLR) and the change from pretest probability to posttest probability of DLD in the three age groups with four questions in PLCQ.

Stratum	DLD	TLD	SSLR	Pretest probability*	Pretest odds	Posttest odds	Posttest probability
Global, 4 to 6-year-old (n = 680)
4	46	14	8.792	0.12	0.136	1.199	0.55
3	57	38	4.014			0.547	0.35
2	28	71	1.055			0.144	0.13
1	27	104	0.695			0.095	0.09
0	27	268	0.270			0.037	0.04
Total	185	495

SSLR, stratum-specific likelihood ratio.

*For the pretest probabilities, we used estimates of the prevalence of DLD in Mexican children aged 4 to 6 years obtained from another study [Auza, A., Murata, C., and Méndez, I. (under review). Prevalence of developmental language disorders in Mexico. Semin. Speech Lang.].