Table 2.

Generalized linear model of blood loss after vaginal birth by OXTR genotype (rs53576) accounting for relevant covariates

	Total blood loss volume β(95%CI)
Model 1
OXTR A/G & A/A (vs. GG)	203.78 (6.01 – 401.54)*
European Ancestry vs. None	40.77 (-219.51 – 301.07)
Model 2
OXTR A/G & A/A (vs. GG)	300.76 (126.61 – 474.92)***
European Ancestry vs. None	110.21 (-112.84 – 333.27)
Oxytocin dosage during labor (per Unit)	24.20 (7.64 – 40.76)**
Model 3
OXTR A/G & A/A (vs. GG)	275.24 (96.33 – 454.16)**
European Ancestry vs. None	147.18 (-79.13 – 373.49)
Oxytocin dosage during labor (per Unit)	20.85 (3.64 – 38.07)*
Primiparity	125.77 (-68.33 – 319.88)
Model 4
OXTR A/G & A/A (vs. GG)	278.09 (100.36 – 455.83)**
European Ancestry vs. None	133.36 (-94.05 – 360.77)
Oxytocin dosage during labor (per Unit)	20.68 (-3.08 – 38.28)*
Primiparity	95.89 (-124.97 – 316.76)
Genital tract lacerations	29.46 (-55.09 – 127.26)
Model 5
OXTR A/G & A/A (vs. GG)	275.16 (96.92 – 453.40)**
European Ancestry vs. None	148.99 (-75.19 – 373.18)
Oxytocin dosage during labor (per Unit)	21.25 (3.74 – 38.75)*
Primiparity	21.25 (3.74 – 38.75)*
Active Management of Third Stage Labor	-33.04 (-259.81 – 193.72)

^*models including Latin American ancestry as a covariate were not materially different than controlling for only European ancestry