| aORa | 95%CIa | P | |||
---|---|---|---|---|---|---|
All participants | ||||||
 Stage | ||||||
  Non-pregnancy | 1.00 | - | - | - | ||
  First trimester | 1.33 | 1.32 | 1.35 | < 0.001 | ||
  Third trimester | 0.76 | 0.72 | 0.80 | < 0.001 | ||
 Age group, years | ||||||
  18–20 | 1.31 | 1.28 | 1.34 | < 0.001 | ||
  21–25 | 1.02 | 1.00 | 1.03 | 0.026 | ||
  26–30 | 1.00 | - | - | - | ||
  31–35 | 1.03 | 1.00 | 1.05 | 0.015 | ||
  > 35 | 1.05 | 1.02 | 1.07 | < 0.001 | ||
 Occupation | ||||||
  Worker | 1.00 | - | - | - | ||
  Farmer | 1.36 | 1.33 | 1.40 | < 0.001 | ||
  Others | 1.01 | 0.97 | 1.05 | 0.544 | ||
 Ethnic | ||||||
  Han | 1.00 | - | - | - | ||
  Yi | 1.18 | 1.16 | 1.21 | < 0.001 | ||
  Hani | 1.72 | 1.66 | 1.77 | < 0.001 | ||
  Miao | 1.32 | 1.27 | 1.37 | < 0.001 | ||
  Others | 1.40 | 1.38 | 1.43 | < 0.001 |