Table 2
Baseline characteristics of 75,421 parous women in the Mexican Teachers' Cohort according to mean duration of lactation per child
| Characteristics | Mean duration of lactation per child | ||||
|---|---|---|---|---|---|
| 0 months (n = 2,545) | <3 months (n = 16,457) | 3 to <6 months (n = 22,643) | 6 to <12 months (n = 23,637) | ≥12 months (n = 10,139) | |
| Age (years) | 45.2 (7.1) | 44.9 (7.0) | 44.8 (6.9) | 44.2 (6.9) | 43.9 (6.9) |
| Age at first birth (years) | 24.2 (4.3) | 24.9 (4.5) | 24.8 (4.4) | 25.2 (4.5) | 25.2 (4.6) |
| Age at menarche (years) | 12.4 (1.4) | 12.5 (1.4) | 12.5 (1.4) | 12.6 (1.5) | 12.7 (1.7) |
| Weight at 18 years (kg) | 52.8 (8.5) | 52.7 (8.2) | 52.3 (7.8) | 52.1 (7.5) | 52.0 (7.6) |
| Current weight (kg) | 70.5 (13.2) | 69.3 (12.8) | 68.6 (12.2) | 68.2 (11.7) | 67.9 (11.8) |
| Current BMI (kg/m2) | 28.1 (4.8) | 27.6 (4.7) | 27.3 (4.5) | 27.2 (4.4) | 27.4 (4.4) |
| Gestational weight gain (kg) | 17.2 (5.5) | 17.0 (5.4) | 17.3 (5.4) | 17.2 (5.4) | 16.7 (5.3) |
| Family history of diabetes (%) | 56.8 | 56.6 | 56.9 | 55.9 | 56.1 |
| Dietary pattern (%) | |||||
| Healthy (Quintile 5) | 19.1 | 19.5 | 20.8 | 20.9 | 20.1 |
| Western (Quintile 5) | 23.2 | 22.7 | 20.6 | 18.2 | 15.1 |
| Modern Mexican (Quintile 5) | 22.8 | 20.6 | 18.5 | 18.2 | 21.5 |
| Physical activity (MET hr/week) | 32.8 (30.7) | 33.0 (30.6) | 34.6 (31.4) | 35.6 (32.4) | 35.7 (33.1) |
| Married (%) | 77.2 | 76.0 | 78.4 | 79.7 | 78.7 |
| Smoking history (%) | |||||
| Never | 72.8 | 74.8 | 76.3 | 80.2 | 83.4 |
| Former | 16.1 | 13.9 | 13.3 | 11.4 | 9.4 |
| Current | 11.1 | 11.2 | 10.4 | 8.3 | 6.8 |
| Postgraduate education (%) | 13.8 | 13.9 | 14.3 | 13.4 | 12.2 |
| Socio‐economic status (%) | |||||
| Low (Tertile 1) | 16.9 | 17.2 | 16.7 | 20.7 | 27.1 |
| Medium (Tertile 2) | 28.0 | 26.9 | 28.8 | 29.6 | 30.5 |
| High (Tertile 3) | 55.1 | 55.8 | 54.4 | 49.6 | 42.4 |
Note. Values are mean (SD) unless otherwise specified. Baseline was defined as enrolment at MTC (2008).
Abbreviation: MET, metabolic equivalent.