TABLE 3.

The relations between responsive caregiving or opportunities for early learning and development of infants in different income groups.

Variable	Annual family income < ¥200,000	Annual family income ≥ ¥200,000
	aOR† (95%CI)	aOR† (95%CI)
Responsive caregiving (1 vs. 3)	0.510 (0.414∼0.627)***	1.129 (0.815∼1.565)
Responsive caregiving (2 vs. 3)	0.456 (0.325∼0.638)***	0.700 (0.402∼1.220)
Opportunities for early learning (1 vs. 3)	0.742 (0.585∼0.942)*	0.681 (0.473∼0.981)*
Opportunities for early learning (2 vs. 3)	0.298 (0.176∼0.504)***	0.373 (0.180∼0.773)**

^†Adjustment for maternal age at delivery, maternal education level, the infant sex, preterm, delivery mode, and birthweight. Responsive caregiving (1 to fluctuating-exposure, 2 to sustained high-exposure, 3 to sustained low-exposure), opportunities for early learning (1 to fluctuating-exposure, 2 to sustained high-exposure, 3 to sustained low-exposure). *P < 0.05, **P < 0.01, ***P < 0.00.