Skip to main content

Table 4 Association between gestational age and fat-free mass indicators

From: Prematurity and body composition at 6, 18, and 30 years of age: Pelotas (Brazil) 2004, 1993, and 1982 birth cohorts

  FFM (kg) %FFM FFMI (kg/m2)
β (CI95%) β (CI95%) β (CI95%)
Gestational age Crude Adjusted Crude Adjusted Crude Adjusted
Male
6 y (2004 Cohort) p < 0.001 p = 0.010 p < 0.001 p = 0.008 p < 0.001 p < 0.001
   ≤ 33 −1.6 (− 2.50; − 0.61) −0.5 (− 1.16; 0.12) 2.7 (0.11; 5.29) 0.7 (− 2.26; 3.67) − 0.5 (− 0.76; − 0.17) − 0.5 (− 0.82; − 0.13)
  34 to 36 −0.8 (− 1.29; − 0.37) − 0.4 (− 0.77; − 0.12) 2.1 (0.89; 3.40) 2.4 (0.87; 3.90) −0.3 (− 0.42; − 0.14) −0.3 (− 0.46; − 0.10)
  37 to 41 ref ref ref ref ref ref
18 y (1993 Cohort) p = 0.192 p = 0.684 p = 0.711 p = 0.454 p = 0.911 p = 0.562
   ≤ 33 −0.7 (−3.30; 1.86) 0.4 (− 1.60; 2.43) 1.2 (− 1.94; 4.26) 1.6 (− 1.59; 4.72) − 0.05 (− 1.01; 0.90) −0.4 (− 1.41; 0.54)
  34 to 36 −1.1 (− 2.40; 0.13) − 0.4 (− 1.41; 0.63) 0.3 (− 1.20; 1.84) −0.6 (− 2.17; 0.98) −0.10 (− 0.57; 0.37) 0.1 (− 0.34; 0.63)
  37 to 41 ref ref ref ref ref ref
30 y (1982 Cohort) p = 0.667 p = 0.451 p = 0.013 p = 0.085 p = 0.669 p = 0.814
   ≤ 33 −3.46 (−11.21; 4.30) − 2.48 (− 10.95; 5.99) −13.13 (− 22.03; − 4.24) −13.52 (− 25.87; − 1.17) − 0.92 (− 2.93; 1.09) −1.01 (− 3.77; 1.75)
  34 to 36 0.14 (− 1.24; 1.52) − 0.69 (− 1.90; 0.51) 0.46 (− 1.12; 2.04) 0.46 (− 1.19; 2.10) − 0.01 (− 0.37; 0.35) −0.22 (− 0.62; 0.17)
  37 to 41 ref ref ref ref ref ref
Female
6 y (2004 Cohort) p = 0.005 p = 0.946 p = 0.001 p = 0.442 p = 0.041 p = 0.180
   ≤ 33 −1.2 (− 2.14; − 0.19) 0.03 (− 0.88; 0.95) 1.5 (− 1.29; 4.27) 0.9 (−3.1; 5.04) − 0.3 (− 0.57; 0.04) −0.2 (− 0.71; 0.24)
  34 to 36 − 0.6 (− 1.00; − 0.10) −0.06 (− 0.42; 0.30) 2.3 (1.03; 3.60) 1.0 (− 0.60; 2.66) −0.1 (− 0.29; − 0.00) −0.2 (− 0.34; 0.03)
  37 to 41 ref ref ref ref ref ref
18 y (1993 Cohort) p = 0.621 p = 0.646 p = 0.519 p = 0.386 p = 0.685 p = 0.471
   ≤ 33 −0.2 (− 1.71; 1.41) −0.2 (− 1.47; 1.15) 1.4 (− 1.01; 3.83) 1.6 (− 0.82; 3.96) −0.40 (− 1.29; 0.50) −0.5 (− 1.40; 0.38)
  34 to 36 0.4 (− 0.47; 1.34) 0.3 (− 0.41; 1.10) 0.1 (− 1.28; 1.53) − 0.3 (− 1.71; 1.09) 0.00 (− 0.52; 0.52) 0.1 (− 0.41; 0.63)
  37 to 41 ref ref ref ref ref ref
30 y (1982 Cohort) p = 0.252 p = 0.200 p = 0.262 p = 0.369 p = 0.369 p = 0.349
   ≤ 33 −4.04 (−8.82; 073) −3.09 (− 6.96; 0.78) 0.37 (− 7.09; 7.82) − 0.18 (− 7.32; 6.95) − 1.14 (− 2.73; 0.44) − 0.90 (− 2.39; 0.59)
  34 to 36 − 0.02 (− 0.92; 0.88) − 0.39 (− 1.24; 0.45) 1.17 (− 0.23; 2.57) 1.04 (− 0.41; 2.50) − 0.00 (− 0.30; 0.30) −0.14 (− 0.47; 0.18)
  37 to 41 ref ref ref ref ref ref
  1. FFM fat-free mass, %FFM percentage of fat-free mass, FFMI fat-free mass index
  2. β refers to linear regression models. Models were adjusted for maternal (education, age, family income at birth, smoking during pregnancy, and pre-gestational BMI) and cohort participant characteristics (birth weight in z-score, skin color and height (except for FFMI))