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Table 2 Effect estimates for simultaneous joint-change sensitivity analyses

From: The associations between environmental quality and preterm birth in the United States, 2000–2005: a cross-sectional analysis

   County-level prevalence differences Individual-level odds ratios
Strata   EQI Joint-change EQI Joint-change
Overall Q1 ref ref ref ref
Q2 −0.0021 (−0.0052, 0.001) −0.0047 (−0.0112, 0.0018) 0.96 (0.94, 0.99) 0.93 (0.89, 0.99)
Q3 −0.0038 (−0.007, −0.0007) −0.0123 (−0.0186, −0.0059) 0.93 (0.91, 0.95) 0.90 (0.85, 0.94)
Q4 −0.0098 (−0.013, −0.0066) −0.0178 (−0.0241, −0.0115) 0.87 (0.85, 0.89) 0.83 (0.79, 0.87)
Q5 −0.0166 (−0.0198, −0.0134) −0.0312 (−0.0365, −0.0259) 0.82 (0.80, 0.84) 0.74 (0.71, 0.77)
Metropolitan urbanized Q1 ref ref ref ref
Q2 0.0025 (−0.002, 0.0071) 0.0042 (−0.0052, 0.0135) 1.01 (0.98, 1.05) 1.07 (1.00, 1.15)
Q3 −0.0092 (−0.0138, −0.0046) −0.003 (−0.0122, 0.0062) 0.92 (0.88, 0.95) 1.02 (.95, 1.1)
Q4 −0.012 (−0.0166, −0.0075) 0.0033 (−0.0059, 0.0126) 0.90 (0.87, 0.93) 0.98 (0.91, 1.05)
Q5 −0.0207 (−0.0253, −0.0161) 0.0033 (−0.0065, 0.0131) 0.83 (0.80, 0.85) 0.94 (0.87, 1.01)
Non-metropolitan urbanized Q1 ref ref ref ref
Q2 0.0049 (−0.0023, 0.0122) 0.0078 (−0.006, 0.0217) 0.99 (0.93, 1.05) 1.00 (0.88, 1.15)
Q3 0.0046 (−0.0035, 0.0126) −0.0154 (−0.0307, 0) 0.96 (0.90, 1.02) 0.82 (0.71, 0.94)
Q4 −0.001 (−0.0094, 0.0074) −0.0044 (−0.0183, 0.0095) 0.90 (0.85, 0.96) 0.84 (0.74, 0.95)
Q5 −0.0091 (−0.0176, −0.0005) −0.0069 (−0.0215, 0.0077) 0.82 (0.77, 0.88) 0.79 (0.70, 0.90)
Less urban Q1 ref ref ref ref
Q2 −0.0046 (−0.0093, 0.0002) −0.0059 (−0.0152, 0.0034) 0.97 (0.93, 1.01) 0.93 (0.85, 1.02)
Q3 −0.0105 (−0.0155, −0.0055) −0.0179 (−0.0273, −0.0085) 0.89 (0.85, 0.93) 0.82 (0.75, 0.90)
Q4 −0.0183 (−0.0235, −0.013) −0.0231 (−0.0329, −0.0134) 0.82 (0.79, 0.86) 0.75 (0.68, 0.82)
Q5 −0.0249 (−0.0303, −0.0195) −0.0253 (−0.0346, −0.0159) 0.76 (0.72, 0.79) 0.71 (0.65, 0.78)
Rural/isolated Q1 ref ref ref ref
Q2 −0.0016 (−0.0112, 0.0081) 0.0104 (−0.0088, 0.0296) 0.94 (0.88, 1.01) 1.03 (0.88, 1.20)
Q3 −0.0052 (−0.0151, 0.0048) 0.0012 (−0.0193, 0.0217) 0.87 (0.80, 0.93) 0.87 (0.73, 1.02)
Q4 −0.0145 (−0.0248, −0.0043) −0.009 (−0.0305, 0.0126) 0.81 (0.75, 0.87) 0.80 (0.67, 0.94)
Q5 −0.0222 (−0.0326, −0.0117) −0.0073 (−0.027, 0.0125) 0.73 (0.68, 0.79) 0.81 (0.70, 0.95)