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Table 2 Means and standard deviations of fat-free mass indicators according to gestational age

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

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)
  1. SD standard deviation, FFM fat-free mass in kg, %FFM percent of fat-free mass, FFMI fat-free mass index in kg/m2
  2. 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