TABLE 5.

DLD probabilities at the pretest and two posttests combined with four questions in the PLCQ and (time children attended preschool) data.

Prob1	Odds 1	PLCQ4	DLD (n = 21)	TLD (n = 41)	SSLR	Odds 2	Prob 2	Preschool > median	LR	Odds 3	Prob 3
0.12	0.136	3–4	12	14	4.367	0.596	0.37	No	1.829	1.194	0.52
		2	5	23	1.108	0.151	0.13	No	1.829	0.303	0.22
		1	3	29	0.527	0.072	0.07	No	1.829	0.144	0.12
		0	1	41	0.124	0.017	0.02	No	1.829	0.034	0.03
								Yes	0.525	0.342	0.24
								Yes	0.525	0.087	0.07
								Yes	0.525	0.041	0.04
								Yes	0.525	0.010	0.01

Prob 1: estimated prevalence of DLD in Mexico used as the pretest probability for DLD prior to the application of four questions in the PLCQ. Odds 1: pretest odds calculated from pretest probability. PLCQ4: 4 stratums of SSLR based on the results of the four questions in the PLCQ. Odds 2: posttest odds for DLD according to the result of four questions on PLCQ weighted by the SSLR. Prob 2: posttest probability calculated from the posttest odds. Preschool: (time children attended preschool) dichotomized into ≤ and > the median within age groups (for 4-, 5-, and 6-year-olds, 1.5, 2.5, and 3.5 years, respectively). LR: likelihood ratios for children ≤ median or > median for (time children attended preschool). Odds 3: posttest odds for DLD according to (time children attended preschool) weighted by the LR. Prob 3: posttest probability calculated after the combination of 4 questions on PLCQ and (time children attended preschool).