Table 2.
Monthly change in percentage of body mass index at the 95th percentile (%BMIp95) during participants’ first session; bivariate (unadjusted) analyses overall and stratified by age, sex, year/season of enrollment, starting %BMIp95, race/ethnicity, insurance type
| Monthly Change (95% CI) | P-value† | |
|---|---|---|
| Overall | −1.54 (−1.68, −1.40) | <0.001 |
| Age group | 0.062 | |
| Older; > 12 yr | −1.37 (−1.60, −1.15) | |
| Younger; ≤ 12 yr | −1.64 (−1.82, −1.47) | |
| Sex | <0.001 | |
| Male | −1.91 (−2.13, −1.68) | |
| Female | −1.33 (−1.51, −1.16) | |
| Season of first session | 0.005 | |
| Spring | −1.81 (−2.24, −1.39) | |
| Fall | −1.74 (−1.95, −1.53) | |
| Winter | −1.30 (−1.50, −1.09) | |
| Enrollment year | <0.001 | |
| Early (2008 - 2010) | −1.88 (−2.11, −1.66) | |
| Middle (2011 - 2014) | −1.43 (−1.66, −1.21) | |
| Late (2015 - 2018) | −1.19 (−1.47, −0.92) | |
| Starting %BMIp95 ‡ | <0.001 | |
| Overweight | −0.88 (−1.15, −0.61) | |
| Class 1 obesity | −1.12 (−1.32, −0.92) | |
| Class 2 obesity | −1.40 (−1.54, −1.25) | |
| Class 3 obesity | −1.86 (−2.03, −1.68) | |
| Race/ethnicity | 0.535 | |
| Hispanic or Latino | −1.36 (−1.64, −1.09) | |
| Non-Hispanic Black | −1.60 (−1.84, −1.35) | |
| Non-Hispanic White | −1.62 (−1.89, −1.36) | |
| Other/unknown | −1.57 (−1.91, −1.23) | |
| Insurance type | 0.84 | |
| Public | −1.57 (−1.77, −1.38) | |
| Private | −1.48 (−1.72, −1.25) | |
| Other/unknown | −1.57 (−1.92, −1.22) |
†:
p-value type-3 omnibus test
‡:
Slopes of categories defined by average baseline %BMIp95 of participants in each category; Interpretation for baseline %BMIp95: For each additional unit increase in baseline %BMIp95 we expect a decrease (improvement) of 0.015 (−0.020, −0.010) in % BMI percent of 95% per month