Table 1.
Characteristics of Iowa Fluoride Study cohort members by early childhood body mass index percentile trajectories
| Total | Trajectory Group 1 |
Trajectory Group 2 |
Trajectory Group 3 |
Trajectory Group 4 |
Chi-square p-value |
|
|---|---|---|---|---|---|---|
| N=1,093 | n=115 | n=409 | n=215 | n=354 | ||
| Total | n (%) | n (%) | n (%) | n (%) | n (%) | -- |
| Child sex | 0.14 | |||||
| Male | 539 (49.3) | 45 (39.1) | 210 (51.3) | 107 (49.8) | 177 (50.0) | |
| Female | 554 (50.7) | 70 (60.9) | 199 (48.7) | 108 (50.2) | 177 (50.0) | |
| Maternal race | 0.62 | |||||
| White | 1,050 (96.3) | 112 (98.2) | 395 (98.6) | 206 (95.8) | 337 (95.7) | |
| Non-White | 40 (3.7) | 2 (1.8) | 14 (3.4) | 9 (4.2) | 15 (4.3) | |
| Maternal 4- year college degree† |
0.48 | |||||
| No | 489 (44.7) | 50 (43.5) | 172 (42.0) | 99 (46.0) | 168 (47.5) | |
| Yes | 604 (55.3) | 65 (56.5) | 237 (58.0) | 116 (54.0) | 186 (52.5) | |
| Annual family income† |
0.60 | |||||
| < $40K | 587 (55.7) | 61 (56.0) | 208 (53.8) | 116 (54.5) | 202 (58.6) | |
| ≥ $40K | 467 (44.3) | 48 (44.0) | 179 (46.2) | 97 (45.5) | 143 (41.4) | |
†
Assessed between 1992 and 1995.
Trajectory Groups 1 to 4 represent four distinct patterns of body mass index percentile trajectory from birth to age 23 months as shown in Figure 1.
Data for participants with missing data for maternal race (n=3) and for annual family income (n=39) were excluded.