Characteristics of mothers and children originally enrolled in the 2015 Pelotas Birth Cohort and participants included in recent follow-ups
| Characteristic at birth . | Original cohort . | 2 years . | 4 years . | 5 years (WebCOVID-19a) . | 6–7 years . |
|---|---|---|---|---|---|
| No. of participants | 4275 | 4014 | 4010 | 2183 | 3867 |
| Maternal age (years) | |||||
| <19 | 431 (10.1%) | 400 (10.0%) | 406 (10.1%) | 187 (8.6%) | 397 (10.3%) |
| 19–34 | 3210 (75.1%) | 3025 (75.4%) | 3015 (75.2%) | 1675 (76.7%) | 2909 (75.2%) |
| ≥35 | 633 (14.8%) | 589 (14.7%) | 588 (14.7%) | 320 (14.7%) | 560 (14.5%) |
| Maternal education (years of completed schooling) | |||||
| 0 | 17 (0.4%) | 16 (0.4%) | 17 (0.4%) | 5 (0.2%) | 16 (0.4%) |
| 1–4 | 374 (8.8%) | 340 (8.5%) | 336 (8.4%) | 105 (4.8%) | 328 (8.5%) |
| 5–8 | 1095 (25.6%) | 1036 (25.8%) | 1044 (26.0%) | 484 (22.2%) | 1007 (26.1%) |
| ≥9 | 2788 (65.2%) | 2621 (65.3%) | 2612 (65.2%) | 1589 (72.8%) | 2514 (65.0%) |
| Wealth index (quintile) | |||||
| Poorest | 824 (20.0%) | 771 (19.9%) | 773 (20.0%) | 333 (15.6%) | 748 (20.0%) |
| Second | 829 (20.1%) | 787 (20.3%) | 794 (20.5%) | 427 (20.0%) | 774 (20.7%) |
| Third | 820 (19.9%) | 776 (20.0%) | 775 (20.0%) | 440 (20.6%) | 755 (20.2%) |
| Fourth | 823 (19.9%) | 766 (19.8%) | 772 (19.9%) | 467 (21.8%) | 739 (19.8%) |
| Wealthiest | 831 (20.1%) | 776 (20.0%) | 759 (19.6%) | 471 (22.0%) | 719 (19.3%) |
| Family income (minimum wages)b | |||||
| <1.1 | 498 (12.4%) | 463 (12.2%) | 461 (12.2%) | 201 (9.6%) | 448 (12.3%) |
| 1.1 to <3.1 | 1891 (47.1%) | 1787 (47.3%) | 1799 (47.7%) | 973 (46.7%) | 1754 (48.3%) |
| 3.1 to <6.1 | 1064 (26.5%) | 1006 (26.6%) | 1003 (26.6%) | 591 (28.4%) | 947 (26.0%) |
| 6.1 to <10.1 | 307 (7.6%) | 283 (7.5%) | 281 (7.5%) | 170 (8.1%) | 268 (7.4%) |
| ≥10.1 | 256 (6.4%) | 240 (6.4%) | 228 (6.0%) | 150 (7.2%) | 218 (6.0%) |
| Parity | |||||
| 1 | 2136 (50.0%) | 2012 (50.1%) | 2002 (49.9%) | 1160 (53.2%) | 1950 (50.5%) |
| 2 | 1320 (30.9%) | 1238 (30.9%) | 1241 (31.0%) | 679 (31.1%) | 1187 (30.7%) |
| ≥3 | 817 (19.1%) | 762 (19.0%) | 765 (19.1%) | 343 (15.7%) | 728 (18.8%) |
| Type of delivery | |||||
| Normal | 1489 (34.8%) | 1410 (35.1%) | 1413 (35.2%) | 744 (34.1%) | 1360 (35.2%) |
| Caesarean section | 2786 (65.2%) | 2604 (64.9%) | 2597 (64.8%) | 1439 (65.9%) | 2507 (64.8%) |
| Child sex | |||||
| Male | 2164 (50.6%) | 2030 (50.6%) | 2028 (50.6%) | 1119 (51.3%) | 1953 (50.5%) |
| Female | 2111 (49.4%) | 1984 (49.4%) | 1982 (49.4%) | 1064 (48.7%) | 1914 (49.5%) |
| Child birthweight (g) | |||||
| <2500 | 428 (10.1%) | 383 (9.6%) | 384 (9.6%) | 182 (8.3%) | 372 (9.6%) |
| 2500–3499 | 2717 (63.8%) | 2573 (64.1%) | 2570 (64.1%) | 1413 (64.8%) | 2490 (64.4%) |
| ≥3500 | 1113 (26.1%) | 1055 (26.3%) | 1053 (26.3%) | 587 (26.9%) | 1003 (26.0%) |
| Characteristic at birth . | Original cohort . | 2 years . | 4 years . | 5 years (WebCOVID-19a) . | 6–7 years . |
|---|---|---|---|---|---|
| No. of participants | 4275 | 4014 | 4010 | 2183 | 3867 |
| Maternal age (years) | |||||
| <19 | 431 (10.1%) | 400 (10.0%) | 406 (10.1%) | 187 (8.6%) | 397 (10.3%) |
| 19–34 | 3210 (75.1%) | 3025 (75.4%) | 3015 (75.2%) | 1675 (76.7%) | 2909 (75.2%) |
| ≥35 | 633 (14.8%) | 589 (14.7%) | 588 (14.7%) | 320 (14.7%) | 560 (14.5%) |
| Maternal education (years of completed schooling) | |||||
| 0 | 17 (0.4%) | 16 (0.4%) | 17 (0.4%) | 5 (0.2%) | 16 (0.4%) |
| 1–4 | 374 (8.8%) | 340 (8.5%) | 336 (8.4%) | 105 (4.8%) | 328 (8.5%) |
| 5–8 | 1095 (25.6%) | 1036 (25.8%) | 1044 (26.0%) | 484 (22.2%) | 1007 (26.1%) |
| ≥9 | 2788 (65.2%) | 2621 (65.3%) | 2612 (65.2%) | 1589 (72.8%) | 2514 (65.0%) |
| Wealth index (quintile) | |||||
| Poorest | 824 (20.0%) | 771 (19.9%) | 773 (20.0%) | 333 (15.6%) | 748 (20.0%) |
| Second | 829 (20.1%) | 787 (20.3%) | 794 (20.5%) | 427 (20.0%) | 774 (20.7%) |
| Third | 820 (19.9%) | 776 (20.0%) | 775 (20.0%) | 440 (20.6%) | 755 (20.2%) |
| Fourth | 823 (19.9%) | 766 (19.8%) | 772 (19.9%) | 467 (21.8%) | 739 (19.8%) |
| Wealthiest | 831 (20.1%) | 776 (20.0%) | 759 (19.6%) | 471 (22.0%) | 719 (19.3%) |
| Family income (minimum wages)b | |||||
| <1.1 | 498 (12.4%) | 463 (12.2%) | 461 (12.2%) | 201 (9.6%) | 448 (12.3%) |
| 1.1 to <3.1 | 1891 (47.1%) | 1787 (47.3%) | 1799 (47.7%) | 973 (46.7%) | 1754 (48.3%) |
| 3.1 to <6.1 | 1064 (26.5%) | 1006 (26.6%) | 1003 (26.6%) | 591 (28.4%) | 947 (26.0%) |
| 6.1 to <10.1 | 307 (7.6%) | 283 (7.5%) | 281 (7.5%) | 170 (8.1%) | 268 (7.4%) |
| ≥10.1 | 256 (6.4%) | 240 (6.4%) | 228 (6.0%) | 150 (7.2%) | 218 (6.0%) |
| Parity | |||||
| 1 | 2136 (50.0%) | 2012 (50.1%) | 2002 (49.9%) | 1160 (53.2%) | 1950 (50.5%) |
| 2 | 1320 (30.9%) | 1238 (30.9%) | 1241 (31.0%) | 679 (31.1%) | 1187 (30.7%) |
| ≥3 | 817 (19.1%) | 762 (19.0%) | 765 (19.1%) | 343 (15.7%) | 728 (18.8%) |
| Type of delivery | |||||
| Normal | 1489 (34.8%) | 1410 (35.1%) | 1413 (35.2%) | 744 (34.1%) | 1360 (35.2%) |
| Caesarean section | 2786 (65.2%) | 2604 (64.9%) | 2597 (64.8%) | 1439 (65.9%) | 2507 (64.8%) |
| Child sex | |||||
| Male | 2164 (50.6%) | 2030 (50.6%) | 2028 (50.6%) | 1119 (51.3%) | 1953 (50.5%) |
| Female | 2111 (49.4%) | 1984 (49.4%) | 1982 (49.4%) | 1064 (48.7%) | 1914 (49.5%) |
| Child birthweight (g) | |||||
| <2500 | 428 (10.1%) | 383 (9.6%) | 384 (9.6%) | 182 (8.3%) | 372 (9.6%) |
| 2500–3499 | 2717 (63.8%) | 2573 (64.1%) | 2570 (64.1%) | 1413 (64.8%) | 2490 (64.4%) |
| ≥3500 | 1113 (26.1%) | 1055 (26.3%) | 1053 (26.3%) | 587 (26.9%) | 1003 (26.0%) |
WebCOVID-19 is the name of the follow-up assessment completed by internet during the COVID-19 pandemic, when cohort children were aged 5 years. There were also assessments completed during pregnancy and at 3 and 12 months postpartum, but those have been described in a previous publication.1
In some previous publications [e.g.1], the definition of intervals between income groups was mis-specified, and those have been corrected here.
Characteristics of mothers and children originally enrolled in the 2015 Pelotas Birth Cohort and participants included in recent follow-ups
| Characteristic at birth . | Original cohort . | 2 years . | 4 years . | 5 years (WebCOVID-19a) . | 6–7 years . |
|---|---|---|---|---|---|
| No. of participants | 4275 | 4014 | 4010 | 2183 | 3867 |
| Maternal age (years) | |||||
| <19 | 431 (10.1%) | 400 (10.0%) | 406 (10.1%) | 187 (8.6%) | 397 (10.3%) |
| 19–34 | 3210 (75.1%) | 3025 (75.4%) | 3015 (75.2%) | 1675 (76.7%) | 2909 (75.2%) |
| ≥35 | 633 (14.8%) | 589 (14.7%) | 588 (14.7%) | 320 (14.7%) | 560 (14.5%) |
| Maternal education (years of completed schooling) | |||||
| 0 | 17 (0.4%) | 16 (0.4%) | 17 (0.4%) | 5 (0.2%) | 16 (0.4%) |
| 1–4 | 374 (8.8%) | 340 (8.5%) | 336 (8.4%) | 105 (4.8%) | 328 (8.5%) |
| 5–8 | 1095 (25.6%) | 1036 (25.8%) | 1044 (26.0%) | 484 (22.2%) | 1007 (26.1%) |
| ≥9 | 2788 (65.2%) | 2621 (65.3%) | 2612 (65.2%) | 1589 (72.8%) | 2514 (65.0%) |
| Wealth index (quintile) | |||||
| Poorest | 824 (20.0%) | 771 (19.9%) | 773 (20.0%) | 333 (15.6%) | 748 (20.0%) |
| Second | 829 (20.1%) | 787 (20.3%) | 794 (20.5%) | 427 (20.0%) | 774 (20.7%) |
| Third | 820 (19.9%) | 776 (20.0%) | 775 (20.0%) | 440 (20.6%) | 755 (20.2%) |
| Fourth | 823 (19.9%) | 766 (19.8%) | 772 (19.9%) | 467 (21.8%) | 739 (19.8%) |
| Wealthiest | 831 (20.1%) | 776 (20.0%) | 759 (19.6%) | 471 (22.0%) | 719 (19.3%) |
| Family income (minimum wages)b | |||||
| <1.1 | 498 (12.4%) | 463 (12.2%) | 461 (12.2%) | 201 (9.6%) | 448 (12.3%) |
| 1.1 to <3.1 | 1891 (47.1%) | 1787 (47.3%) | 1799 (47.7%) | 973 (46.7%) | 1754 (48.3%) |
| 3.1 to <6.1 | 1064 (26.5%) | 1006 (26.6%) | 1003 (26.6%) | 591 (28.4%) | 947 (26.0%) |
| 6.1 to <10.1 | 307 (7.6%) | 283 (7.5%) | 281 (7.5%) | 170 (8.1%) | 268 (7.4%) |
| ≥10.1 | 256 (6.4%) | 240 (6.4%) | 228 (6.0%) | 150 (7.2%) | 218 (6.0%) |
| Parity | |||||
| 1 | 2136 (50.0%) | 2012 (50.1%) | 2002 (49.9%) | 1160 (53.2%) | 1950 (50.5%) |
| 2 | 1320 (30.9%) | 1238 (30.9%) | 1241 (31.0%) | 679 (31.1%) | 1187 (30.7%) |
| ≥3 | 817 (19.1%) | 762 (19.0%) | 765 (19.1%) | 343 (15.7%) | 728 (18.8%) |
| Type of delivery | |||||
| Normal | 1489 (34.8%) | 1410 (35.1%) | 1413 (35.2%) | 744 (34.1%) | 1360 (35.2%) |
| Caesarean section | 2786 (65.2%) | 2604 (64.9%) | 2597 (64.8%) | 1439 (65.9%) | 2507 (64.8%) |
| Child sex | |||||
| Male | 2164 (50.6%) | 2030 (50.6%) | 2028 (50.6%) | 1119 (51.3%) | 1953 (50.5%) |
| Female | 2111 (49.4%) | 1984 (49.4%) | 1982 (49.4%) | 1064 (48.7%) | 1914 (49.5%) |
| Child birthweight (g) | |||||
| <2500 | 428 (10.1%) | 383 (9.6%) | 384 (9.6%) | 182 (8.3%) | 372 (9.6%) |
| 2500–3499 | 2717 (63.8%) | 2573 (64.1%) | 2570 (64.1%) | 1413 (64.8%) | 2490 (64.4%) |
| ≥3500 | 1113 (26.1%) | 1055 (26.3%) | 1053 (26.3%) | 587 (26.9%) | 1003 (26.0%) |
| Characteristic at birth . | Original cohort . | 2 years . | 4 years . | 5 years (WebCOVID-19a) . | 6–7 years . |
|---|---|---|---|---|---|
| No. of participants | 4275 | 4014 | 4010 | 2183 | 3867 |
| Maternal age (years) | |||||
| <19 | 431 (10.1%) | 400 (10.0%) | 406 (10.1%) | 187 (8.6%) | 397 (10.3%) |
| 19–34 | 3210 (75.1%) | 3025 (75.4%) | 3015 (75.2%) | 1675 (76.7%) | 2909 (75.2%) |
| ≥35 | 633 (14.8%) | 589 (14.7%) | 588 (14.7%) | 320 (14.7%) | 560 (14.5%) |
| Maternal education (years of completed schooling) | |||||
| 0 | 17 (0.4%) | 16 (0.4%) | 17 (0.4%) | 5 (0.2%) | 16 (0.4%) |
| 1–4 | 374 (8.8%) | 340 (8.5%) | 336 (8.4%) | 105 (4.8%) | 328 (8.5%) |
| 5–8 | 1095 (25.6%) | 1036 (25.8%) | 1044 (26.0%) | 484 (22.2%) | 1007 (26.1%) |
| ≥9 | 2788 (65.2%) | 2621 (65.3%) | 2612 (65.2%) | 1589 (72.8%) | 2514 (65.0%) |
| Wealth index (quintile) | |||||
| Poorest | 824 (20.0%) | 771 (19.9%) | 773 (20.0%) | 333 (15.6%) | 748 (20.0%) |
| Second | 829 (20.1%) | 787 (20.3%) | 794 (20.5%) | 427 (20.0%) | 774 (20.7%) |
| Third | 820 (19.9%) | 776 (20.0%) | 775 (20.0%) | 440 (20.6%) | 755 (20.2%) |
| Fourth | 823 (19.9%) | 766 (19.8%) | 772 (19.9%) | 467 (21.8%) | 739 (19.8%) |
| Wealthiest | 831 (20.1%) | 776 (20.0%) | 759 (19.6%) | 471 (22.0%) | 719 (19.3%) |
| Family income (minimum wages)b | |||||
| <1.1 | 498 (12.4%) | 463 (12.2%) | 461 (12.2%) | 201 (9.6%) | 448 (12.3%) |
| 1.1 to <3.1 | 1891 (47.1%) | 1787 (47.3%) | 1799 (47.7%) | 973 (46.7%) | 1754 (48.3%) |
| 3.1 to <6.1 | 1064 (26.5%) | 1006 (26.6%) | 1003 (26.6%) | 591 (28.4%) | 947 (26.0%) |
| 6.1 to <10.1 | 307 (7.6%) | 283 (7.5%) | 281 (7.5%) | 170 (8.1%) | 268 (7.4%) |
| ≥10.1 | 256 (6.4%) | 240 (6.4%) | 228 (6.0%) | 150 (7.2%) | 218 (6.0%) |
| Parity | |||||
| 1 | 2136 (50.0%) | 2012 (50.1%) | 2002 (49.9%) | 1160 (53.2%) | 1950 (50.5%) |
| 2 | 1320 (30.9%) | 1238 (30.9%) | 1241 (31.0%) | 679 (31.1%) | 1187 (30.7%) |
| ≥3 | 817 (19.1%) | 762 (19.0%) | 765 (19.1%) | 343 (15.7%) | 728 (18.8%) |
| Type of delivery | |||||
| Normal | 1489 (34.8%) | 1410 (35.1%) | 1413 (35.2%) | 744 (34.1%) | 1360 (35.2%) |
| Caesarean section | 2786 (65.2%) | 2604 (64.9%) | 2597 (64.8%) | 1439 (65.9%) | 2507 (64.8%) |
| Child sex | |||||
| Male | 2164 (50.6%) | 2030 (50.6%) | 2028 (50.6%) | 1119 (51.3%) | 1953 (50.5%) |
| Female | 2111 (49.4%) | 1984 (49.4%) | 1982 (49.4%) | 1064 (48.7%) | 1914 (49.5%) |
| Child birthweight (g) | |||||
| <2500 | 428 (10.1%) | 383 (9.6%) | 384 (9.6%) | 182 (8.3%) | 372 (9.6%) |
| 2500–3499 | 2717 (63.8%) | 2573 (64.1%) | 2570 (64.1%) | 1413 (64.8%) | 2490 (64.4%) |
| ≥3500 | 1113 (26.1%) | 1055 (26.3%) | 1053 (26.3%) | 587 (26.9%) | 1003 (26.0%) |
WebCOVID-19 is the name of the follow-up assessment completed by internet during the COVID-19 pandemic, when cohort children were aged 5 years. There were also assessments completed during pregnancy and at 3 and 12 months postpartum, but those have been described in a previous publication.1
In some previous publications [e.g.1], the definition of intervals between income groups was mis-specified, and those have been corrected here.
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