Table 1

Participant characteristics at recruitment to RUBY RCT

CharacteristicsRespondents
(n=360*)
Non-respondents
(n=141)
P value
Maternal age at recruitment to RCT (years) mean (SD)31.9 (4.6 (SD))29.2 (5.4 (SD))<0.001
n %n %
Married or living with partner349 (96.9)130 (92.2)0.02
Education level graduate degree or higher256 (71.3)71 (50.4)<0.001
Household weekly income pre-tax ($AUD)<0.001
 Less than $140083 (23.0)65 (46.1)
 $A1400 or more243 (67.5)52 (36.1)
 Declined to answer34 (9.4)24 (17.0)
Pension or benefit n=35910 (2.8)20 (14.2)<0.001
Born in Australia192 (53.3)56 (39.7)<0.006
English as first language245 (68.1)70 (49.7)<0.001
Smoked pre pregnancy37 (10.2)28 (19.9)0.01
Caesarean birth95 (26.4)47 (33.3)0.12
Baby gestation at birth (weeks) mean (SD)39.6 (1.2 (SD))39.3 (1.1 (SD))0.01
Birth weight (grams) mean (SD)3401.7 (445.7 (SD))3367.4 (459.9 (SD))0.44
Baby admitted to neonatal/special care nursery24 (6.7)6 (4.3)0.31
Baby had formula since birth, prior to recruitment to RUBY RCT62 (17.2)40 (28.4)0.005
Plans to breast feed 6 months or more281 (78.1)113 (80.1)0.19
Level of breastfeeding support from family and friends0.81
 No support4 (1.1)3 (2.1)
 A little support33 (9.2)14 (9.9)
 Moderate support62 (17.2)22 (15.6)
 A lot of support261 (72.5)105 (74.5)
Breastfeeding outcomes at 6-month interview
 Any breast milk293 (81.4)83 (58.7)<0.001
 Only breast milk (may include solids)216 (60.0)52 (36.9)<0.001
  • *Includes 19 participants who returned survey but did not receive ongoing calls.

  • RCT, randomised controlled trial; RUBY, ringing up about breastfeeding early.