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Table 1 Characteristics of the sample. The 1993 Pelotas (Brasil) Birth Cohort

From: Physical activity throughout adolescence and body composition at 18 years: 1993 Pelotas (Brazil) birth cohort study

Variables Boys Girls
n(%) n(%)
Skin color
 Black 1480 (68.2) 1473 (65.5)
 White 271 (12.6) 284 (12.6)
 Brown 316 (14.5) 388 (17.2)
 Yellow 44 (2.0) 49 (2.2)
 Indigenous 58 (2.7) 57 (2.5)
Asset índex in quintiles
 1st (poorest) 445 (21.1) 418 (19.2)
 2nd 414 (19.6) 437 (20.1)
 3rd 401 (19.0) 456 (21.0)
 4rd 414 (19.6) 443 (20.4)
 5rd (richest) 436 (20.7) 420 (19.3)
Tanner stage (pubic hair)
 1 9 (0.5) 56 (2.7)
 2 85 (4.7) 238 (11.4)
 3 374 (20.5) 811 (38.8)
 4 774 (42.3) 784 (37.5)
 5 586 (32.0) 200 (9.6)
MVPA 11, 15 and 18y (≥300 min/week)
 Has never reached 112 (6.3) 474 (24.6)
 Reached once 391 (21.9) 741 (38.5)
 Reached twice 725 (40.5) 544 (28.3)
 Has always reached 559 (31.3) 164 (8.6)
Physical activity (moderate-intensity)11, 15 and 18y (>150 min/week)   
 Has never reached 190 (10.5) 219 (11.3)
 Reached once 588 (32.4) 555 (28.5)
 Reached twice 702 (38.6) 712 (36.5)
 Has always reached 337 (18.5) 462 (23.7)
Physical activity (vigorous-intensity) 11, 15 and 18y (>75 min/week)   
 Has never reached 184 (10.2) 1.095 (56.2)
 Reached once 436 (24.1) 657 (33.7)
 Reached twice 696 (38.4) 173 (8.9)
 Has always reached 495 (27.3) 24 (1.2)
Screen time at 11y (hours/day) in tertiles - Mean (SD)   
 Upper 7.7 (2.2) 7.5 (1.9)
 Middle 4.3 (0.5) 4.3 (0.6)
 Bottom 1.9 (0.9) 1.9 (0.9)
Body mass index at 11y in tertiles - Mean (SD)
 Upper 22.6 (3.0) 22.6 (3.0)
 Middle 17.7 (0.8) 17.8 (0.8)
 Bottom 15.4 (0.8) 15.2 (1.0)
Fat mass (kg) - Mean (SD) 12.8 (9.4) 21.9 (9.3)
Lean mass (kg) - Mean (SD) 54.3 (6.0) 36.5 (4.4)
Fat mass index at 18y - Mean (SD) 4.2 (3.0) 8.4 (3.6)
Lean mass index at 18y - Mean (SD) 18.0 (1.6) 13.2 (1.4)
  1. MVPA Moderate to vigorous physical activity