Table 1.
Attrition bias and summary for characteristics of children, parents, and households by year.
| Variables | 2012 | 2014 | 2016 | 2018 |
|---|---|---|---|---|
| No. | 1042 | 777 | 541 | 409 |
| Children’s characteristics | ||||
| Age in 2012, median (IQR) | 13.00 (11.00,15.00) | 13.00 (11.00,15.00) | 13.00 (11.00,15.00) | 13.00 (11.00,15.00) |
| Sex (Female), No. (%) | 537 (51.5) | 386 (49.7) | 262 (48.4) | 197 (48.2) |
| Parents’ characteristics | ||||
| Maternal age in 2012, median (IQR) | 39.00 (36.00,42.00) | 39.00 (36.00,42.00) | 39.00 (36.00,42.00) | 39.00 (36.00,41.75) |
| Paternal age in 2012, median (IQR) | 40.50 (38.00,44.00) | 40.00 (38.00,44.00) | 40.00 (38.00,43.50) | 40.00 (38.00,44.00) |
| Lived together with the father ≥ 8 months, 2012, No. (%) | 552 (55.3) | 429 (57.4) | 307 (59.2) | 245 (62.3) |
| Lived together with the mother ≥ 8 months, 2012, No. (%) | 672 (67.3) | 517 (69.1) | 369 (71.1) | 294 (74.8) |
| Father had symptoms of depression in 2012, No. (%) | 201 (25.4) | 146 (24.0) | 104 (24.2) | 71 (21.6) |
| Mother had symptoms of depression in 2012, No. (%) | 317 (36.4) | 228 (34.5) | 163 (34.7) | 115 (32.8) |
| Father had a job in 2012, No. (%) | 694 (77.5) | 531 (77.3) | 351 (74.2) | 280 (77.1) |
| Mother had a job in 2012, No. (%) | 609 (65.7) | 469 (66.7) | 315 (63.8) | 242 (65.4) |
| Household characteristics | ||||
| Lived in urban areas in 2012, No. (%) | 438 (42.3) | 330 (42.7) | 227 (42.1) | 190 (46.7) |
| Household size in 2012, median (IQR) | 4.00 (4.00,6.00) | 4.00 (4.00,6.00) | 4.00 (4.00,6.00) | 4.00 (4.00,5.00) |
| Mathematics test scores, median (IQR) | 9.00 (7.00,13.00) | 15.00 (10.00,17.00) | 12.00 (8.00,13.00) | 17.00 (14.00,23.00) |
IQR, interquartile range.