Table 4.

Final multivariate models for illness due to gastrointestinal illness.

	Model A	Model B
Parameter	Exp(B) (95% CI), p	Exp(B) (95% CI), p
(Intercept)	0.006 (0.003–0.012), <0.001	0.013 (0.011–0.016), <0.001
Eligible for free or reduced lunch
Yes	1.204 (1.074–1.350), 0.001	1.203 (1.073–1.349), 0.002
No	1	1
Ethnic group
Other	0.763 (0.661–0.882), <0.001	0.764 (0.661–0.882), <0.001
Hispanic	0.847 (0.751–0.956), 0.007	0.840 (0.744–0.949), 0.005
Caucasian	1	1
School headcounta	0.947 (0.920–0.974), <0.001	0.941 (0.915–0.968), <0.001
School level weekly absence ratio	1.046 (1.040–1.053), <0.001	1.046 (1.039–1.053), <0.0010
Ventilation adequacy
Inadequate in all classrooms	0.930 (0.846–1.024), 0.140	0.942 (0.859–1.034), 0.208
Adequate in at least part of the classrooms	1	1
LgATP	1.164 (1.009–1.344), 0.037	–
Study group	–
Intervention school		0.914 (0.837–0.997, 0.042)
Control school		1

^aPer 100 students increase.