Table 1.
Percentage of cohort located according to socioeconomic characteristics, birgh weight, and breast feeding
| Baseline characteristic | Original cohort (No (%)) | No (%) traced in 2000 |
|---|---|---|
| Monthly family income (US$) in 1982:
| ||
| ≤50 | 666 (22.0) | 483 (72.5) |
| 51-150 | 1463 (48.4) | 1170 (80.0) |
| 151-300 | 544 (18.0) | 456 (83.8) |
| 301-500 | 184 (6.1) | 146 (79.3) |
| >500 | 167 (5.5) | 128 (76.6) |
| Total | 3024* | P<0.001† |
| Maternal schooling (years) in 1982:
| ||
| 0-4 | 1008 (33.2) | 768 (76.2) |
| 5-8 | 1288 (42.5) | 1048 (81.4) |
| 9-11 | 330 (10.9) | 249 (75.5) |
| ≥12 | 406 (13.4) | 323 (79.6) |
| Total | 3032* | P=0.008† |
| Birth weight (g) in 1982:
| ||
| <2500 g | 244 (8.0) | 189 (77.5) |
| ≥2500g | 2791 (92.0) | 2344 (78.9) |
| Total | 3035* | P=0.30† |
| Duration of total breast feeding (months), 1983-6:
| ||
| <1 | 636 (23.3) | 511 (80.3) |
| 1-2.9 | 708 (25.9) | 577 (81.5) |
| 3-5.9 | 611 (22.3) | 519 (84.9) |
| 6-8.9 | 261 (9.5) | 210 (80.5) |
| 9-11.9 | 114 (4.2) | 90 (78.9) |
| ≥12 | 405 (14.8) | 328 (81.0) |
| Total | 2735* | P=0.29† |
| Duration of predominant breast feeding (months), 1983-6:
| ||
| <1 | 757 (28.9) | 619 (81.8) |
| 1-1.9 | 405 (15.4) | 328 (81.0) |
| 2-2.9 | 489 (18.6) | 407 (83.2) |
| 3-3.9 | 662 (25.2) | 561 (84.7) |
| ≥4 | 309 (11.8) | 243 (78.6) |
| Total | 2622* | P=0.17† |
*
Total numbers do not add to 3037 owing to missing information.
†
χ2 test for heterogeneity (χ2 test for proportions; analysis of variance for means).