Skip to main content

Table 1 Characteristics of cohort members and their mothers at the time of birth and in the last follow-up of each cohort, by sex. The 1982, 1993 and 2004 Pelotas (Brazil) birth cohorts, 2010–2013

From: Caesarean section and adiposity at 6, 18 and 30 years of age: results from three Pelotas (Brazil) birth cohorts

  2004 cohort 1993 cohort 1982 cohort
6 years 18 years 30 years
Male Female Male Female Male Female
Past categorical variables (at birth) N (%) N (%) N (%) N (%) N (%) N (%)
Maternal skin colour
 White 1267 (74.2) 1166 (72.5) 1519 (77.3) 1529 (76.7) 1429 (81.5) 1538 (83.0)
 Brown/Black 441 (25.8) 443 (27.5) 446 (22.7) 465 (23.3) 324 (18.5) 315 (17.0)
Maternal schooling (years)
 0–4 254 (15.0) 241 (15.2) 517 (26.3) 536 (26.9) 558 (31.9) 595 (32.1)
 5–8 697 (41.1) 680 (42.8) 940 (47.9) 947 (47.5) 766 (43.7) 782 (42.3)
  ≥ 9 746 (43.9) 669 (42.1) 507 (25.8) 511 (25.6) 428 (24.4) 474 (25.6)
Maternal BMI (pre-gestational)a
 Normal 978 (57.3) 897 (56.4) 1480 (77.7) 1491 (76.2) 1181 (77.9) 1201 (76.3)
 Overweight 486 (28.5) 446 (28.1) 325 (17.1) 366 (18.7) 266 (17.6) 297 (18.9)
 Obese 242 (14.2) 247 (15.5) 101 (5.3) 99 (5.1) 69 (4.6) 77 (4.9)
Financing of delivery
 Public 1383 (81.0) 1311 (81.6) 1708 (86.9) 1734 (86.9) 1611 (91.9) 1678 (90.6)
 Private 324 (19.0) 295 (18.4) 257 (13.1) 262 (13.1) 143 (8.1) 175 (9.4)
Birth weight (grams)
  < 2500 123 (7.2) 159 (9.9) 148 (7.5) 209 (10.5) 103 (5.9) 156 (8.4)
  ≥ 2500 1585 (92.8) 1450 (90.1) 1817 (92.5) 1787 (89.5) 1651 (94.1) 1696 (91.6)
Type of delivery
 Normal 905 (53.0) 905 (56.3) 1353 (68.9) 1376 (68.9) 1258 (71.7) 1348 (72.8)
 C-section 803 (47.0) 704 (43.7) 612 (31.2) 620 (31.1) 496 (28.3) 505 (27.3)
Current continuous variables Mean (sd) Mean (sd) Mean (sd) Mean (sd) Mean (sd) Mean (sd)
Fat mass index (kg/m2) 3.3 (2.3) 4.2 (2.5) 4.2 (3.0) 8.4 (3.6)a 6.7 (3.2)a 10.6 (4.3)a
BMI Z-score 0.71 (1.5) 0.66 (1.4) 0.29 (1.2)a 0.45 (1.2)a 0.03 (0.9)a −0.02 (1.1)a
Height (cm) 121.6 (5.6) 120.3 (5.6) 173.8 (6.9) 161.0 (6.4) 174.4 (6.9) 161.4 (6.2)
All 1708 (51.5) 1609 (48.5) 1965 (49.6) 1996 (50.4) 1754 (48.6) 1853 (51.4)
  1. Abbreviations: BMI Body Mass Index
  2. aFor the 2004 cohort, we used information about maternal BMI three months after birth
  3. Maximum percentage of unknown observations: n = 556 (14.3%) for maternal BMI (pre-gestational) in the 1982 cohort study; n = 99 (2.5%) for maternal BMI (pre-gestational) in the 1993 cohort study