Table 3. Participant Demographics at Baseline by School and by Session in the Build Our Kids’ Success (BOKS) Evaluation, Massachusetts, 2018.
| Characteristics | Total (N = 128)a | By School |
By Session |
|||||
|---|---|---|---|---|---|---|---|---|
| Elementary School 1 (n = 50) | Elementary School 2 (n = 47) | Middle School (n = 31) | P Valueb | Spring (N = 86) | Fall (N = 42) | P Valueb | ||
| Age, mean (SD), y | 9.3 (2.2) | 8.3 (1.6) | 8.4 (1.6) | 12.2 (0.7) | <.01 | 9.3 (2.2) | 9.2 (2.2) | .90 |
| Male, no. (%) | 61 (48) | 26 (52) | 20 (43) | 15 (48) | .57 | 45 (52) | 16 (38) | .90 |
| Baseline BMI, kg/m2, mean (SD)a | 20.4 (4.4) | 19.2 (2.5) | 20.0 (4.2) | 21.4 (4.4) | .05 | 20.3 (4.0) | 20.5 (5.2) | .06 |
| Baseline BMI z score, median (IQR)c | 1.16 (0.39, 1.73) | 1.24 (0.60, 1.82) | 1.39 (0.44, 1.96) | 0.64 (.21, 1.39) | .12 | 1.26 (0.40, 1.87) | 1.32 (0.50, 1.55) | .47 |
| Child BMI Category, no. (%) | .17d | — | — | .50d | ||||
| <85th percentile, no. (%) | 50 (45) | 18 (43) | 14 (35) | 18 (64) | — | 34 (45) | 13 (38) | — |
| 85th–95th percentile | 27 (25) | 17 (40) | 16 (40) | 6 (21) | — | 17 (22) | 10 (29) | — |
| >95th percentile | 33 (30) | 7 (17) | 10 (25) | 4 (14) | — | 25 (33) | 8 (24) | — |
| Race/ethnicity, no. (%) | — | — | — | .90 | ||||
| Hispanic/ Latino | 52 (41) | 26 (52) | 15 (32) | 11 (35) | — | 31 (36) | 21 (50) | — |
| Non-Hispanic White | 29 (23) | 10 (20) | 11 (23) | 8 (26) | — | 20 (23) | 9 (21) | — |
| Non-Hispanic Black | 8 (6) | 3 (6) | 3 (6) | 2 (6) | — | 6 (7) | 2 (5) | — |
| Other | 13 (10) | 6 (12) | 6 (13) | 1 (3) | — | 9 (11) | 4 (9) | — |
| Declined | 26 (20) | 5 (10) | 12 (25) | 9 (29) |
— | 20 (23) | 6 (14) | — |
Abbreviation: — , not applicable; BMI, body mass index.
a
N = 112 total participants with complete baseline anthropometrics for BMI calculation, 78 in spring, 34 in fall.
b
t tests, ANOVA, and Wilcoxon tests were used for continuous variables; χ2 tests used for categorical variables; race/ethnicity by school not assessed because of insufficient sample size.
c
For BMI z-score calculation, total N = 110 participants, 2 students are missing data on age.
d
P values represent χ2 analysis for BMI category across schools and sessions.