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. Author manuscript; available in PMC: 2023 Jan 1.
Published in final edited form as: J Hum Lact. 2021 Nov 28;38(2):287–297. doi: 10.1177/08903344211057876

Table 1.

Maternal, Infant, and Childbirth Characteristics with Bivariate Associations with Infant Feeding Substance During Postpartum Hospitalization.

Infant Feeding During
Postpartum Hospitalization
Total sample
(n=2401)
Exclusive
Mom's Milk
(n=2152)
Formula
Supplementation
(n=249)
χ 2 (df) p
Maternal characteristics n (%) n (%) n (%)
Relationship
 Married or civil partnership 2205 (91.91) 1981 (89.84) 224 (10.16) 5.60 (2) 0.078
 Not married, living with partner 139 (5.79) 125 (89.93) 14 (10.07)
 Other 55 (2.29) 44 (80.00) 11 (20.00)
Education completed
 Some college to doctorate 2303 (95.92) 2066 (89.71) 237 (10.29) 0.39 (1) 0.50
 High School or less 98 (4.08) 86 (87.76) 12 (12.24)
Race
 White 2218 (93.00) 1994 (89.90) 224 (10.10) 0.60 (1) 0.427
 Other 167 (7.00) 147 (88.02) 20 (11.98)
Ethnicity
 Hispanic/Latina 142 (5.99) 127 (89.44) 15 (10.56) 0.01 (1) 0.887
 Not Hispanic/Latina 2227 (94.01) 1997 (89.67) 230 (10.33)
Insurance status
 Insured 2349 (98.04) 2107 (89.70) 242 (10.30) 1.04 (1) 0.329
 Uninsured 47 (1.96) 40 (85.11) 7 (14.89)
Household income in the previous year
 Less than $75,000 1035 (44.17) 927 (89.57) 108 (10.43) 0.02 (1) 0.893
 $75,000 or greater 1308 (55.83) 1169 (89.37) 139 (10.63)
Baby-friendly designated facility
 Yes 1392 (57.98) 1251 (89.87) 141 (10.13) 0.56 (2) 0.761
 No 362 (15.08) 326 (90.06) 36 (9.94)
 Unsure 647 (26.95) 575 (88.87) 72 (11.13)
Mode of childbirth
 Cesarean section 396 (18.83) 326 (82.32) 70 (17.68) 33.19 (1) <.001
 Vaginal 1707 (81.17) 1569 (91.92) 138 (8.08)
Gestational age at birth
 ≥37 weeks gestation 2129 (88.86) 1926 (90.47) 203 (9.53) 15.37 (2) 0.001
 34+0 to 36+6 weeks gestation 239 (9.97) 197 (82.43) 42 (17.57)
 <34 weeks gestation 28 (1.17) 24 (85.71) 4 (14.29)
Infant received any care in the neonatal intensive care unit
 Yes 235 (9.81) 168 (71.49) 67 (28.51) 92.60 (1) <.001
 No 2161 (90.19) 1980 (91.62) 181 (8.38)

Note. Missing value: Relationship other = Single (never married), divorced, separated, or widowed. Race other = Black; Asian; Native American, Hawaiian, or Pacific Islander; or other (please specify).