. 2022 Jun 22;130(6):067006. doi: 10.1289/EHP10302

Table 3.

Mean WPPSI-IV composite scores and estimated intervention effects in primary intention-to-treat ( $lowercase italic n equals 475$ ) and secondary complete case ( $lowercase italic n equals 383$ ) analyses from the Ulaanbaatar Gestation and Air Pollution Research trial in Ulaanbaatar, Mongolia.

	Intention-to-treat analysis				Complete case analysis
	Mean score (standard deviation)		Unadjusted intervention effect estimate (95% CI)	Adjusted intervention effect estimate^a (95% CI)	Mean score (standard deviation)		Unadjusted intervention effect estimate (95% CI)	Adjusted intervention effect estimate^a (95% CI)
	Control ( $lowercase italic n equals 233$ )	Intervention ( $lowercase italic n equals 242$ )	Unadjusted intervention effect estimate (95% CI)	Adjusted intervention effect estimate^a (95% CI)	Control ( $lowercase italic n equals 182$ )	Intervention ( $lowercase italic n equals 201$ )	Unadjusted intervention effect estimate (95% CI)	Adjusted intervention effect estimate^a (95% CI)
Full scale IQ	97.3 (15.2)	99.8 (13.9)	2.5 ( $negative 0.4$ , 5.4)	2.8 ( $negative 0.1$ , 5.7)	97.3 (14.9)	100.1 (13.5)	2.8 (0.0, 5.7)	3.2 (0.3, 6.0)
Verbal comprehension	97.3 (16.5)	100.8 (16.1)	3.5 (0.2, 6.8)	3.8 (0.4, 7.1)	97.4 (15.8)	101.2 (15.5)	3.8 (0.6, 6.9)	4.2 (1.1, 7.4)
Visual spatial	94.5 (16.3)	95.6 (15.1)	1.0 ( $negative 2.4$ , 3.9)	1.2 ( $negative 1.9$ , 4.3)	94.5 (15.7)	95.7 (14.5)	1.2 ( $negative 1.8$ , 4.2)	1.3 ( $negative 1.8$ , 4.4)
Fluid reasoning	97.7 (16.9)	98.5 (17.0)	0.8 ( $negative 2.5$ , 4.1)	1.0 ( $negative 2.3$ , 4.3)	97.8 (16.4)	98.8 (16.6)	0.9 ( $negative 2.4$ , 4.3)	1.0 ( $negative 2.3$ , 4.3)
Working memory	103.0 (15.1)	104.3 (14.3)	1.3 ( $negative 1.5$ , 4.2)	1.4 ( $negative 1.5$ , 4.3)	103.1 (14.5)	104.5 (13.3)	1.4 ( $negative 1.4$ , 4.2)	1.5 ( $negative 1.3$ , 4.4)
Processing speed	99.0 (14.1)	99.6 (13.7)	0.6 ( $negative 2.2$ , 3.4)	0.7 ( $negative 2.0$ , 3.5)	99.0 (13.6)	99.9 (13.1)	0.9 ( $negative 1.7$ , 3.6)	1.1 ( $negative 1.6$ , 3.8)
Nonverbal	97.8 (15.8)	99.1 (14.7)	1.4 ( $negative 1.6$ , 4.3)	1.6 ( $negative 1.4$ , 4.5)	97.8 (15.5)	99.5 (14.1)	1.7 ( $negative 1.3$ , 4.7)	1.9 ( $negative 1.1$ , 4.8)
General ability	96.9 (15.9)	99.6 (14.7)	2.6 ( $negative 0.4$ , 5.8)	3.0 ( $negative 0.2$ , 6.1)	97.0 (15.4)	99.9 (14.2)	2.9 ( $negative 0.1$ , 5.8)	3.2 (0.2, 6.2)
Cognitive proficiency	101.5 (15.0)	102.6 (13.8)	1.1 ( $negative 1.7$ , 3.9)	1.3 ( $negative 1.5$ , 4.1)	101.5 (14.5)	102.9 (13.0)	1.4 ( $negative 1.4$ , 4.1)	1.4 ( $negative 1.2$ , 4.3)

Note: CI, confidence interval; WPPSI-IV, Wechsler Preschool and Primary Scale of Intelligence, Fourth Edition.

^{^a}

Adjusted for preterm birth.