Supplemental Table 2. Cohort demographics and obstetric, labor and delivery characteristics for missing and non-missing variable "pain unpleasantness max"





  Data are reported as frequency[%]or mean(standard deviation) 


	Number of supplemental labor epidural analgesia doses	0.295 (1.0)	0.367 (0.80)	0.70
		Missing (n=86)	Non-missing (n=87)	P-value
	Race			
	American Indian	1/79 [1.3]	0/87 [0]	
	Asian Black	8/79 [10.1] 20/79 [25.3] 14/ 87 [16.1] 4/ 87 [4.6]	0.067
	White	49/79 [62.0] 69/ 87 [79.3]	
	Other	1/79 [1.3]	0/87 [0]	
	Ethnicity			
	Hispanic or Latino	1/79 [1.3]	3/87 [3.4]	0.62
	Non-Hispanic or Latino	78/79 [98.7]	84/87 [96.6]	
	Gravidity			
	1	52/67 [77.6]	66/76 [86.8]	
	2	9/67 [13.4]	7/76 [9.2]	0.14
	3	4/67 [6.0]	2/76 [2.6]	
	4	2/67 [3.0]	1/76 [1.3]	
	Parity (zero)	67/67[100]	76/76 [100]	-
	Body Mass Index (kg/m2)	32.2 (6.4)	31.7 (5.7)	0.62
	Estimated Gestational Age (Weeks)	39.2 (1.4)	39.4 (1.2)	0.23
	Plan to use Labor Epidural Analgesia (Yes)	48/78 [61.5]	64/87 [73.6]	0.13
	Prenatal History of Anxiety or Depression (Yes) 31/78 [39.7]	25/86 [29.1]	0.19
	History of Mental Illness other than Anxiety or Depression (Yes)	4/77 [5.2]	8/85 [9.4]	0.38
	Marital Status			
	Single Married	21/77 [27.3] 55/77 [71.4]	22/85 [25.9] 61/85 [71.8]	>0.99
	Divorced	1/77 [1.3]	2/85 [2.4]	
	Education (years)	14.90 (2.04)	15.56 (1.8)	0.032
	Breastfeeding, postpartum day 1-2 (Yes)	8/9 [88.9]	66/70 [94.2]	0.46
	Breastfeeding, 6 weeks postpartum (Yes)	5/6 [83.3]	61/69 [88.4]	0.55
	Breastfeeding, 3 months postpartum (Yes)	4/5 [80.0]	51/67 [76.1]	>0.99
	Mode of delivery			
	Normal Spontaneous vaginal delivery	33/49 [67.3]	60/75 [80.0]	
	Assisted vaginal -vacuum Cesarean -nonreassuring fetus	2/49 [4.1] 3/49 [6.1]	1/75 [1.3] 4/75 [5.3]	0.11
	Cesarean -arrest of dilation/descent	4/49 [8.2]	8/75 [10.7]	
	Cesarean -other	7/49 [14.3]	2/75 [2.7]	
	Perineal lacerations			
	None	19/48 [39.6]	22/75 [29.3]	
	First degree Second degree	5/48 [10.4] 22/48 [45.8]	14/75 [18.7] 37/75 [49.3]	0.51
	Third degree	2/48 [4.2]	1/75 [1.3]	
	Fourth degree	0/75 [0]	1/75 [1.3]	
	Duration of labor (hours)	12.33 (8.30)	17.57 (8.08)	0.002
Supplemental Table 2. Cohort demographics and obstetric, labor and delivery characteristics for missing and non-missing variable "pain unpleasantness max"