Table 6.

OR estimates (95% CIs) for area of residence and IgG test results for six ATSDR studies conducted 1991–1994.

Study area	Model 1a	Model 2b	Model 3c	Model 4d	Model 5e
Results below the reference range
California	—	—	—	—	—
Kentucky	—	—	—	—	—
Massachusetts	0.38 (0.17–0.85)	0.38 (0.17–0.86)	0.40 (0.17–0.94)	0.44 (0.18–1.06)	0.43 (0.18–1.01)
Nebraska	1.53 (0.54–4.34)	1.43 (0.49–4.21)	1.35 (0.44–4.17)	1.31 (0.42–4.13)	1.68 (0.58–4.85)
North Carolina	—	—	—	—	—
Texas	1.22 (0.38–3.89)	1.83 (0.41–8.08)	1.79 (0.38–8.53)	1.68 (0.27–10.44)	1.03 (0.28–3.80)
Results above the reference range
California	0.46 (0.21–1.03)	0.38 (0.16–2.13)	0.38 (0.15–0.96)	0.35 (0.14–0.90)	0.39 (0.16–0.94)
Kentucky	2.60 (0.81–8.38)	2.38 (0.70–8.06)	2.39 (0.70–8.16)	2.57 (0.73–9.07)	2.51 (0.78–8.11)
Massachusetts	1.21 (0.46–3.15)	0.92 (0.34–2.50)	0.72 (0.25–2.05)	0.74 (0.25–2.14)	0.90 (0.33–2.44)
Nebraska	1.22 (0.37–4.05)	1.26 (0.33–4.90)	1.36 (0.34–5.50)	1.02 (0.24–4.30)	1.38 (0.41–4.66)
North Carolina	—	—	—	—	—
Texas	1.63 (0.85–3.10)	1.52 (0.72–3.20)	1.60 (0.75–3.41)	1.52 (0.66–3.49)	1.58 (0.82–3.04)

^—, OR estimates could not be calculated.

^aModel 1: unadjusted.

^bModel 2: adjusted for age, sex, race, Hispanic ethnicity, educational level, years in residence.

^cModel 3: adjusted for the model 2 covariates and other exposure information.

^dModel 4: adjusted for the model 3 covariates, symptoms, illnesses, and overall health.

^eModel 5: adjusted using the backward elimination strategy of Kleinbaum (1994).