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Table 1 Characteristics of the analytic and excluded age-eligible sample born between October 1, 1979 and June 30, 1994

From: Childhood body mass index trajectories: modeling, characterizing, pairwise correlations and socio-demographic predictors of trajectory characteristics

Characteristic Analytic sample Excluded sample
Child-level   
   Total # of children 3289 139057
   Sex, n (%)   
Boys 1680 (51.1) 70216 (50.5)
Girls 1609 (48.9) 68841 (49.5)
   Race/ethnicity, n (%)   
White 2362 (71.8) 59644 (42.9)
Black 214 (6.5) 14341 (10.3)
Other 168 (5.1) 7847 (5.6)
Unknown 503 (15.3) 52443 (37.7)
   Year of birth, n (%)   
1979 ~ 1984 382 (11.6) 38343 (27.6)
1985 ~ 1989 1315 (40.0) 48075 (34.6)
1990 ~ 1994 1592 (48.4) 52639 (37.9)
   Birth weight in grams, mean (SD) 3442 (488) 3433 (507)
   Type of health insurance, %   
Medicaid 129 (3.9) 7,256 (5.2)
Non-Medicaid 3160 (96.1) 131801 (94.8)
Visit-level   
   Total # of visits 81550 993687
   Age at visit (years), n (%)   
0 ~ 1 25188 (30.9) 294540 (29.6)
2 ~ 5 17501 (21.5) 215744 (21.7)
6 ~ 10 16681 (20.5) 175422 (17.7)
11 ~ 14 12974 (15.9) 164369 (16.5)
15 ~ 18 9206 (11.3) 143612 (14.5)
  1. SD, standard deviation