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Table 3 Association of PM2.5 and HDP by gestational periods

From: Correlation between exposure to fine particulate matter and hypertensive disorders of pregnancy in Shanghai, China

  No. of cases (%) Crude RR (95% CI) Adjusted RR (95% CI) P for trend
0–12 gestational weeks
 Continuous 440 5.1 4.03 (2.11–7.72) 3.89 (1.45–10.43)  
 Q1 (< 46.36) 76 3.5 Reference (1.00) Reference (1.00)  
 Q2 (46.36–54.54) 103 4.7 1.33 (0.99–1.79) 1.30 (0.93–1.82)  
 Q3 (54.54–60.06) 129 5.9 1.67 (1.26–2.22) 1.66 (1.11–2.48)  
 Q4 (≥ 60.06) 132 6.0 1.70 (1.28–2.26) 1.67 (1.10–2.53) < 0.01
13–20 gestational weeks
 Continuous 440 5.0 1.11 (0.66–1.87) 0.71 (0.40–1.27)  
 Q1 (< 44.41) 113 5.1 Reference (1.00) Reference (1.00)  
 Q2 (44.41–52.03) 105 4.8 0.93 (0.71–1.21) 0.85 (0.65–1.12)  
 Q3 (52.03–56.35) 109 5.0 0.98 (0.75–1.27) 0.88 (0.67–1.15)  
 Q4 (≥ 56.35) 113 5.2 1.02 (0.78–1.32) 0.85 (0.64–1.12) 0.82
0–20 gestational weeks
 Continuous 440 5.0 2.22 (1.05–4.68) 1.00 (0.38–2.61)  
 Q1 (< 47.35) 97 4.4 Reference (1.00) Reference (1.00)  
 Q2 (47.35–51.42) 103 4.7 1.06 (0.80–1.40) 0.90 (0.67–1.23)  
 Q3 (51.42–57.81) 111 5.1 1.14 (0.87–1.50) 0.89 (0.65–1.24)  
 Q4 (≥ 57.81) 129 5.9 1.33 (1.03–1.74) 1.01 (0.73–1.41) 0.02