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. Author manuscript; available in PMC: 2016 Aug 2.
Published in final edited form as: Prev Med. 2016 May 21;89:162–168. doi: 10.1016/j.ypmed.2016.05.018

Table 3.

Adjusted BMI z-score values for the primary age 3 cohort in the comparison and intervention groups, according to assessment time, with the change in BMIz from baseline values and the intervention × period (I × P) effect size.a

Comparison group
 Intervention group
BMIz score Change BMIz score Change I × P effect p-valueb
Fall 2008 0.69 (0.074) — 0.64 (0.077) — — 0.09
Spring 2009 0.66 (0.075) −0.02 (0.030) 0.67 (0.078) 0.03 (0.032) 0.05 (0.044) 0.25
Fall 2009 0.78 (0.076) 0.09 (0.035) 0.70 (0.078) 0.06 (0.035) −0.03 (0.050) 0.54
Spring 2010 0.80 (0.077) 0.11 (0.040) 0.81 (0.080) 0.17 (0.040) 0.06 (0.057) 0.34
a

Values in parentheses are standard errors. Scores were adjusted for center race/ethnicity strata, prestudy BMI strata, gender, and whether there were dropouts because of attending prekindergarten.

b

The fall 2008 p-value is for the overall intervention effect (intervention × assessment time interaction test result); the other p-values are for period-specific intervention effects not adjusted for multiplicity.