Table 1 Baseline characteristics of the children with and without all anthropometric data at 4, 7 and 10 months old (n = 86,805)
Boy | Girl | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
With data(n = 10,016) | Missing | Without data(n = 34,248) | Missing | Effect sizea | With data(n = 9,801) | Missing | Without data(n = 32,740) | Missing | Effect sizea | |
Gestational age, mean (SD), wk | 39.4 (1.1) | 0 | 39.4 (1.1) | 0 | 0.00 | 39.5 (1.1) | 0 | 39.5 (1.1) | 0 | 0.00 |
Birth length, mean (SD), cm | 49.4 (2.0) | 0 | 49.4 (1.9) | 0 | 0.01 | 48.8 (1.9) | 0 | 48.8 (1.9) | 0 | 0.01 |
Birth weight, mean (SD), g | 3,088 (371) | 0 | 3,117 (367) | 0 | 0.03 | 2,993 (356) | 0 | 3,021 (357) | 0 | 0.03 |
Multipara (%) | 5,179 (51.7) | 0 | 21,291 (62.2) | 0 | 0.09 | 5,040 (51.4) | 0 | 20,455 (62.5) | 0 | 0.09 |
Maternal age, mean (SD), y | 31.4 (4.8) | 1 | 31.1 (5.1) | 4 | 0.03 | 31.4 (4.9) | 0 | 31.0 (5.1) | 1 | 0.03 |
Maternal smoking (%) | 1,435 (14.5) | 112 | 6,418 (19.3) | 948 | 0.05 | 1,429 (14.7) | 109 | 6,167 (19.4) | 891 | 0.05 |
Maternal education (%) | 83 | 856 | 0.05 | 88 | 799 | 0.06 | ||||
Junior high school | 321 (3.2) | 1,798 (5.4) | 282 (2.9) | 1,690 (5.3) | ||||||
High school | 7,233 (72.8) | 24,661 (73.9) | 7,082 (72.9) | 23,732 (74.3) | ||||||
University/graduate school | 2,379 (24.0) | 6,933 (20.8) | 2,349 (24.2) | 6,519 (20.4) | ||||||
Paternal education (%) | 137 | 1,073 | 0.04 | 137 | 1,010 | 0.04 | ||||
Junior high school | 520 (5.3) | 2,619 (7.9) | 545 (5.6) | 2,527 (8.0) | ||||||
High school | 5,887 (59.6) | 19,713 (59.4) | 5,748 (59.5) | 18,882 (59.5) | ||||||
University/graduate school | 3,472 (35.1) | 10,843 (32.7) | 3,371 (34.9) | 10,321 (32.5) | ||||||
Family income (%) | 723 | 3,207 | 0.04 | 687 | 2,882 | 0.03 | ||||
Low | 3,428 (36.9) | 12,719 (41.0) | 3,453 (37.9) | 12,232 (41.0) | ||||||
Middle | 3,162 (34.0) | 10,242 (33.0) | 2,998 (32.9) | 9,837 (32.9) | ||||||
High | 2,703 (29.1) | 8,080 (26.0) | 2,663 (29.2) | 7,789 (26.1) | ||||||
Home speech stimulation (%) | 8,115 (81.4) | 50 | 26,998 (81.1) | 950 | 0.00 | 7,916 (81.4) | 75 | 25,879 (81.3) | 901 | 0.00 |
ND at 6 months (%) | 841 (8.9) | 599 | 2,439 (8.5) | 5,636 | 0.01 | 782 (8.5) | 595 | 2,169 (7.9) | 5,215 | 0.01 |
ND at 12 months (%) | 1,576 (16.9) | 712 | 4,253 (15.8) | 7,324 | 0.01 | 1,221 (13.6) | 819 | 3,247 (12.6) | 6,945 | 0.01 |