Table 4 Comparison of scores on intellectual function tests among the six groups of breastfeeding duration
Breastfeeding duration(months) | 0 to ≤1 | > 1 and ≤3 | > 3 and ≤6 | > 6 and ≤ 12 | > 12 and ≤ 18 | > 18 | Crude | Adjusted | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Â | Â | Â | Â | Â | Â | Â | F | df | p | F | df | p |
K-ASQ at T1 | ||||||||||||
 Communication | 54.0 (8.5) | 53.4 (9.2) | 53.1 (9.4) | 53.2 (9.1) | 54.7 (8.0) | 54.4 (8.8) | 1.65 | 5, 1626 | 0.144 | 0.77 | 5, 1414 | 0.574 |
 Fine motor | 54.1 (9.1) | 54.4 (8.9) | 55.2 (8.6) | 55.0 (8.5) | 55.0 (8.2) | 54.3 (10.0) | 0.67 | 5, 1626 | 0.644 | 0.47 | 5, 1414 | 0.799 |
 Gross motor | 57.5 (6.3) | 57.1 (6.9) | 56.6 (7.5) | 57.6 (5.7) | 57.9 (5.4) | 57.3 (7.2) | 1.34 | 5, 1626 | 0.243 | 0.97 | 5, 1414 | 0.436 |
 Personal, social | 54.6 (7.7) | 53.9 (8.6) | 53.4 (9.9) | 55.2 (7.4) | 55.1 (7.6) | 55.3 (8.4) | 2.20 | 5, 1626 | 0.052 | 0.90 | 5, 1414 | 0.477 |
 Problem solving | 56.4 (6.5) | 55.5 (8.0) | 55.9 (7.9) | 55.9 (7.3) | 56.4 (7.0) | 56.3 (7.7) | 0.65 | 5, 1626 | 0.662 | 0.77 | 5, 1414 | 0.571 |
K-ASQ at T2 | ||||||||||||
 Communication | 47.9 (12.1) | 47.6 (11.8) | 49.6 (10.9) | 50.2 (10.5) | 50.5 (10.8) | 50.0 (11.1) | 3.72 | 5, 1698 | 0.002**, a | 1.84 | 5, 1439 | 0.102 |
 Fine motor | 47.7 (11.8) | 46.4 (12.4) | 48.6 (10.9) | 47.7 (12.0) | 48.7 (11.7) | 47.5 (12.1) | 1.38 | 5, 1698 | 0.228 | 1.67 | 5, 1439 | 0.140 |
 Gross motor | 56.4 (8.8) | 56.3 (9.5) | 57.2 (7.0) | 57.2 (7.7) | 56.0 (9.6) | 55.2 (10.6) | 1.64 | 5, 1698 | 0.146 | 2.05 | 5, 1439 | 0.069 |
 Personal, social | 51.4 (11.9) | 52.7 (10.2) | 52.1 (10.9) | 52.5 (10.9) | 53.1 (10.8) | 52.3 (11.0) | 0.84 | 5, 1698 | 0.518 | 0.84 | 5, 1439 | 0.518 |
 Problem solving | 48.6 (13.4) | 47.5 (13.1) | 49.5 (11.9) | 50.6 (10.7) | 50.5 (11.1) | 49.0 (12.2) | 3.09 | 5, 1698 | 0.009** | 3.83 | 5, 1439 | 0.002**, a |
K-ASQ at T3 | ||||||||||||
 Communication | 52.0 (11.1) | 51.8 (11.6) | 52.9 (11.1) | 53.5 (10.8) | 53.7 (10.5) | 52.4 (11.1) | 1.63 | 5, 1746 | 0.148 | 1.48 | 5, 1466 | 0.192 |
 Fine motor | 52.7 (9.4) | 52.6 (10.2) | 53.2 (8.6) | 53.4 (8.2) | 53.7 (8.3) | 54.1 (9.1) | 1.02 | 5, 1746 | 0.401 | 0.54 | 5, 1466 | 0.742 |
 Gross motor | 57.6 (6.3) | 56.8 (7.1) | 57.5 (5.4) | 57.4 (5.5) | 57.1 (5.9) | 57.3 (5.5) | 0.62 | 5, 1746 | 0.685 | 1.04 | 5, 1466 | 0.390 |
 Personal, social | 54.7 (9.3) | 54.0 (9.7) | 54.7 (8.4) | 55.1 (8.4) | 55.1 (8.4) | 55.4 (9.1) | 0.79 | 5, 1746 | 0.559 | 0.29 | 5, 1466 | 0.921 |
 Problem solving | 53.5 (8.0) | 53.2 (8.4) | 55.0 (7.1) | 54.1 (7.9) | 54.7 (7.2) | 54.1 (8.4) | 1.89 | 5, 1746 | 0.093 | 1.07 | 5, 1466 | 0.375 |
REVT at T4 | ||||||||||||
 Expressive | 4.2 (3.1) | 4.5 (3.1) | 4.6 (3.1) | 5.2 (3.3) | 5.0 (3.3) | 4.9 (3.2) | 3.74 | 5, 1624 | 0.002**, a | 2.44 | 5, 1373 | 0.033* |
 Receptive | 6.4 (3.6) | 6.5 (3.6) | 6.3 (3.5) | 6.5 (3.6) | 6.6 (3.6) | 6.3 (3.5) | 0.21 | 5, 1619 | 0.958 | 0.40 | 5, 1370 | 0.846 |
M-FIT at T9 | ||||||||||||
 Vocabulary | 55.4 (10.7) | 55.4 (10.3) | 57.6 (10.4) | 56.8 (10.3) | 57.3 (10.5) | 56.1 (11.6) | 1.75 | 51,392 | 0.120 | 0.63 | 5, 1176 | 0.678 |
 Language inference | 56.3 (9.9) | 56.5 (9.8) | 56.9 (9.7) | 58.3 (9.7) | 57.9 (8.4) | 56.7 (9.7) | 1.93 | 51,392 | 0.086 | 1.21 | 5, 1176 | 0.303 |
 Schematization | 52.6 (10.4) | 54.5 (9.1) | 54.8 (9.5) | 55.1 (8.7) | 54.6 (9.1) | 53.4 (10.7) | 2.22 | 51,392 | 0.050 | 1.42 | 5, 1176 | 0.215 |
 Calculation | 53.0 (9.8) | 53.8 (9.8) | 53.3 (9.7) | 55.1 (8.9) | 54.3 (10.0) | 52.2 (10.8) | 2.43 | 51,392 | 0.033* | 2.04 | 5, 1176 | 0.071 |
 Spatial perception | 56.0 (10.3) | 56.8 (10.1) | 58.4 (10.2) | 57.6 (10.8) | 56.8 (10.4) | 55.3 (11.7) | 1.90 | 51,392 | 0.091 | 1.02 | 5, 1176 | 0.404 |
 Reasoning | 56.1 (10.3) | 55.2 (11.2) | 56.4 (12.6) | 56.6 (9.9) | 56.1 (10.8) | 54.1 (12.4) | 1.31 | 51,392 | 0.257 | 0.75 | 5, 1176 | 0.589 |