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Table 2 Adjusted odds ratios of male infants by method of fertilization and stage of embryo transfer in ART cycles

From: The risk of secondary sex ratio imbalance and increased monozygotic twinning after blastocyst transfer: data from the Japan Environment and Children’s Study

  AOR 95% CI P-value
Spontaneous conception 1.000 (reference)   
Non-ART treatment 0.979 (0.915–1.048) NS
CT 0.914 (0.789–1.058) NS
BT 1.095 (1.001–1.198) 0.047
  1. Adjusted for the questionnaire results for mother’s age, BMI, metabolic equivalent/min, calorie intake, education, income, smoking status, alcohol intake status, SF-8 physical component summary, SF-8 mental component summary, K6 and history of hyperlipidemia, diabetes, hyperthyroidism, hypothyroidism and the questionnaire results for father’s age, BMI, low education, smoking status, alcohol intake status, SF-8 physical component summary, SF-8 mental component summary, K6
  2. CT (early cleavage-stage embryo transfer), BT (blastocyst transfer), AOR (adjusted odds ratio), CI (confidence interval), NS (not statistically significant)