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Table 1 Summary statistics for PM2.5 levels in the study groups and overall

From: Household air pollution, ultrasound measurement, fetal biometric parameters and intrauterine growth restriction

  Intervention Control All
2nd trimester mean 72-h PM2.5 quartile Median
(min, max)
n Median
(min, max)
n Median
(min, max)
n
Q1 20.3 (5.5–25.1) 32 21.5 (12.8–26.6) 26 20.6 (5.5–26.6) 58
Q2 32.3 (27–40.0) 29 33.0 (27.0–40.5) 29 32.9 (27.0–40.5) 58
Q3 52.5 (40.9–66.5) 28 51.4 (41.3–67.6) 30 51.8 (40.9–67.6) 58
Q4 166.3 (69.6–437.8) 27 161.5 (69.6–437.8) 31 162.6 (69.6–437.8) 58
3rd trimester mean 72-h PM2.5 quartile
 Q1 26.1 (0.7–32.3) 28 22.0 (8.8–31.3) 24 23.8 (0.7–32.3) 52
 Q2 39.7 (32.7–48.2) 26 40.9 (33.9–48.9) 26 40.1 (32.7–48.9) 52
 Q3 62.8 (49.2–106.8) 27 71.5 (49.5–113.8) 25 64.5 (49.2–113.8) 52
 Q4 189.8 (122.2–890.5) 24 186.3 (117.1–698.6) 27 186.4 (117.0–890.5) 51
  1. n sample size; min minimum; max maximum