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Table 1 Means and standard deviations of body fat 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
FM (kg) FM (%) FMI (kg/m2) BMIa (kg/m2)   FM (kg) FM (%) FMI (kg/m2) BMIa (kg/m2)
6 y (2004 Cohort) N Mean (SD)
p < 0.001
Mean (SD)
p < 0.001
Mean (SD)
p < 0.001
Mean (SD)
p < 0.001
N Mean (SD)
p = 0.002
Mean (SD)
p = 0.001
Mean (SD)
p = 0.003
Mean (SD)
p = 0.012
≤33 36 4.8 (3.3) 19.8 (6.8) 3.2 (1.8) 0.05 (1.5) 32 5.8 (3.1) 23.9 (7.1) 4.1 (1.8) 0.51 (1.2)
34 to 36 167 5.1 (3.7) 20.2 (7.4) 3.4 (2.1) 0.21 (1.6) 165 5.7 (3.2) 23.2 (7.2) 3.9 (1.9) 0.40 (1.2)
37 to 41 1361 6.1 (3.6) 22.5 (7.9) 4.0 (2.1) 0.81 (1.5) 1275 6.8 (4.0) 25.5 (8.0) 4.6 (2.4) 0.72 (1.4)
Total 1564 5.9 (3.6) 22.2 (7.9) 3.9 (2.1) 0.72 (1.5) 1472 6.6 (3.8) 25.2 (7.9) 4.5 (2.3) 0.67 (1.4)
18 y (1993 Cohort) N Mean (SD)
p = 0.873
Mean (SD)
p = 0.711
Mean (SD)
p = 0.938
Mean (SD)
p = 0.839
N Mean (SD)
p = 0.660
Mean (SD)
p = 0.519
Mean (SD)
p = 0.710
Mean (SD)
p = 0.746
≤33 32 12.6 (13.4) 15.7 (10.5) 4.4 (4.5) 23.4 (5.7) 42 19.6 (9.5) 31.4 (8.4) 7.6 (3.5) 23.1 (4.7)
34 to 36 143 12.5 (10.0) 16.5 (9.1) 4.1 (3.2) 23.2 (4.3) 133 20.9 (8.7) 32.7 (7.8) 8.1 (3.4) 23.7 (4.6)
37 to 41 1337 12.9 (9.5) 16.8 (8.8) 4.2 (3.1) 23.4 (4.2) 1340 20.9 (9.6) 32.8 (7.9) 8.0 (3.6) 25.5 (4.9)
Total 1512 12.7 (9.6) 16.6 (8.8) 4.2 (3.1) 23.3 (4.2) 1515 20.8 (9.4) 32.7 (7.8) 8.0 (3.6) 23.5 (4.8)
30 y (1982 Cohort) N Mean (SD)
p = 0.047
Mean (SD)
p = 0.012
Mean (SD)
p = 0.034
Mean (SD)
p = 0.279
N Mean (SD)
p = 0.559
Mean (SD)
p = 0.419
Mean (SD)
p = 0.600
Mean (SD)
p = 0.553
≤33 4 35.0 (5.6) 37.7 (2.6) 11.6 (1.6) 30.7 (2.6) 5 23.2 (6.0) 37.2 (3.8) 9.1 (2.0) 24.2 (3.4)
34 to 36 141 20.8 (10.9) 24.1 (9.2) 6.8 (3.5) 26.8 (4.5) 160 26.1 (12.1) 36.6 (9.1) 10.0 (4.6) 26.3 (5.8)
37 to 41 1177 21.4 (11.4) 24.7 (9.0) 7.0 (3.7) 27.0 (4.9) 1157 27.0 (11.9) 37.3 (8.4) 10.3 (4.5) 26.6 (5.9)
Total 1322 21.4 (11.3) 24.6 (9.0) 7.0 (3.7) 27.0 (4.9) 1322 26.8 (11.9) 37.2 (8.4) 10.3 (4.5) 26.5 (5.9)
  1. BMI body mass index, SD standard deviation, FM fat mass in kg, %FM percent of fat mass, FMI fat mass index in kg/m2
  2. aAt 6 years, BMI in Z-score
  3. 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