Baseline | Lost to follow-up | 6-year cohort | Lost to follow-up | 20-year cohort | Participation in all surveys | |
---|---|---|---|---|---|---|
No. (% of baseline population) | 2568 (100.0) | 584 (22.7) | 1984 (77.3) | 945 (36.8) | 1623 (63.2) | 1298 (50.5) |
Age (years) | ||||||
1 | 424 (16.5) | 100 (17.1) | 324 (16.3) | 156 (16.5) | 268 (16.5) | 210 (16.2) |
2 | 405 (15.8) | 104 (17.8) | 301 (15.2) | 147 (15.6) | 258 (15.9) | 199 (15.3) |
3 | 411 (16.0) | 92 (15.8) | 319 (16.1) | 145 (15.3) | 266 (16.4) | 211 (16.3) |
4 | 400 (15.6) | 67 (11.5) | 333 (16.8) | 159 (16.8) | 241 (14.9) | 209 (16.1) |
5 | 415 (16.2) | 101 (17.3) | 314 (15.8) | 151 (16.0) | 264 (16.3) | 208 (16.0) |
6-7 | 513 (20.0) | 120 (20.6) | 393 (19.8) | 187 (19.8) | 326 (20.1) | 261 (20.1) |
Sex | ||||||
male | 1311 (51.1) | 309 (52.9) | 1002 (50.5) | 557 (58.9) | 754 (46.5) | 592 (45.6) |
female | 1257 (49.0) | 275 (47.1) | 982 (49.5) | 388 (41.1) | 869 (53.5) | 706 (54.4) |
Family socioeconomic status at baseline | ||||||
low | 667 (26.1) | 169 (29.1) | 498 (25.2) | 296 (31.5) | 371 (22.9) | 292 (22.5) |
middle/high | 1889 (73.9) | 411 (70.9) | 1478 (74.8) | 643 (68.5) | 1246 (77.1) | 1003 (77.5) |
Duration of breast-feeding in months | ||||||
< 4 | 481 (19.3) | 135 (24.1) | 346 (17.9) | 192 (21.0) | 289 (18.3) | 221 (17.5) |
4 ≤ x < 8 | 670 (26.9) | 159 (28.3) | 511 (26.4) | 250 (27.4) | 420 (26.6) | 333 (26.3) |
≥ 8 | 1343 (53.9) | 267 (47.6) | 1076 (55.7) | 471 (51.6) | 872 (55.2) | 711 (56.2) |
SHS 0–3 | ||||||
yes | 299 (11.6) | 66 (11.3) | 233 (11.7) | 105 (11.1) | 194 (12.0) | 153 (11.8) |
no | 2269 (88.4) | 518 (88.7) | 1751 (88.3) | 840 (88.9) | 1429 (88.1) | 1145 (88.2) |
Mold 0–3 | ||||||
yes | 138 (5.4) | 21 (3.6) | 117 (5.9) | 55 (5.8) | 83 (5.1) | 73 (5.6) |
no | 2428 (94.6) | 569 (96.4) | 1867 (94.1) | 888 (94.2) | 1540 (94.9) | 1225 (94.4) |
SHS 0–13 * | ||||||
yes | 468 (18.2) | 121 (20.7) | 347 (17.5) | 161 (17.0) | 307 (18.9) | 234 (18.0) |
no | 2100 (81.8) | 463 (79.3) | 1637 (82.5) | 784 (83.0) | 1316 (81.1) | 1064 (82.0) |
Mold 0–13 * | ||||||
yes | 385 (15.0) | 35 (6.0) | 350 (17.6) | 150 (15.9) | 235 (14.5) | 220 (17.0) |
no | 2183 (85.0) | 549 (94.0) | 1634 (82.4) | 795 (84.1) | 1388 (85.5) | 1078 (83.1) |
Maternal smoking in pregnancy | ||||||
yes | 364 (14.2) | 104 (17.9) | 260 (13.1) | 160 (17.0) | 204 (12.6) | 156 (12.0) |
no | 2199 (85.8) | 477 (82.1) | 1722 (86.9) | 784 (83.1) | 1415 (87.4) | 1141 (88.0) |