Table 2.
Means and standard deviations of fat-free mass indicators according to gestational age
| Gestational age | Male | Female | ||||||
|---|---|---|---|---|---|---|---|---|
| FFM (kg) | FFM (%) | FFMI (kg/m2) | FFM (kg) | FFM (%) | FFMI (kg/m2) | |||
| 6 y (2004 Cohort) | N |
Mean (SD) p < 0.001 |
Mean (SD) p < 0.001 |
Mean (SD) p < 0.001 |
N |
Mean (SD) p = 0.005 |
Mean (SD) p = 0.001 |
Mean (SD) p = 0.003 |
| ≤33 | 36 | 17.8 (3.2) | 80.2 (6.8) | 7.5 (1.0) | 32 | 17.1 (2.6) | 76.0 (7.2) | 7.3 (0.8) |
| 34 to 36 | 167 | 18.5 (3.0) | 79.7 (7.5) | 7.6 (0.9) | 165 | 17.8 (2.5) | 76.8 (7.2) | 7.4 (0.8) |
| 37 to 41 | 1361 | 19.4 (2.8) | 77.5 (7.9) | 7.9 (0.9) | 1275 | 18.3 (2.8) | 74.5 (8.1) | 7.6 (0.9) |
| Total | 1564 | 19.2 (2.9) | 77.8 (7.8) | 7.9 (0.9) | 1472 | 18.2 (2.8) | 74.8 (8.0) | 7.5 (0.8) |
| 18 y (1993 Cohort) | N |
Mean (SD) p = 0.192 |
Mean (SD) p = 0.711 |
Mean (SD) p = 0.911 |
N |
Mean (SD) p = 0.621 |
Mean (SD) p = 0.519 |
Mean (SD) p = 0.685 |
| ≤33 | 32 | 57.5 (7.1) | 84.3 (10.5) | 3.6 (3.9) | 42 | 40.1 (5.9) | 68.6 (8.4) | 6.1 (2.9) |
| 34 to 36 | 143 | 57.1 (6.6) | 83.5 (9.1) | 3.6 (2.8) | 133 | 40.7 (4.5) | 67.3 (7.8) | 6.5 (2.7) |
| 37 to 41 | 1337 | 58.2 (7.4) | 83.2 (8.8) | 3.7 (2.7) | 1340 | 40.3 (5.1) | 67.2 (7.8) | 6.5 (2.9) |
| Total | 1512 | 58.1 (7.3) | 83.2 (8.8) | 3.7 (2.7) | 1515 | 40.3 (5.1) | 67.3 (7.9) | 6.5 (2.9) |
| 30 y (1982 Cohort) | N |
Mean (SD) p = 0.667 |
Mean (SD) p = 0.013 |
Mean (SD) p = 0.669 |
N |
Mean (SD) p = 0.252 |
Mean (SD) p = 0.262 |
Mean (SD) p = 0.369 |
| ≤33 | 4 | 57.6 (6.6) | 62.3 (2.6) | 19.1 (1.2) | 5 | 38.4 (4.8) | 62.8 (3.8) | 15.1 (1.7) |
| 34 to 36 | 141 | 61.2 (7.3) | 75.9 (9.2) | 20.0 (1.8) | 160 | 42.5 (4.8) | 63.6 (9.1) | 16.2 (1.6) |
| 37 to 41 | 1177 | 61.0 (8.0) | 75.4 (9.0) | 20.0 (2.1) | 1157 | 42.5 (5.5) | 62.5 (8.4) | 16.3 (1.9) |
| Total | 1322 | 61.0 (7.9) | 75.4 (9.1) | 20.0 (2.0) | 1322 | 42.5 (5.4) | 62.6 (8.4) | 16.2 (1.8) |
SD standard deviation, FFM fat-free mass in kg, %FFM percent of fat-free mass, FFMI fat-free mass index in kg/m2
P-values calculated by Analysis of Variance (ANOVA) indicating the difference in means of body fat and BMI, between gestational age groups within each cohort