TABLE 8.
Predictor2 | Adjustment | HR (95% CI) | P |
Pumping frequency as categorical exposure | |||
Third quartile compared with less than or equal to the median | Unadjusted | 1.22 (1.18, 1.26) | 0.01 |
Fourth quartile compared with less than or equal to the median | Unadjusted | 1.31 (1.24, 1.37) | 0.001 |
Third quartile compared with less than or equal to the median | Adjusted3 | 1.17 (1.13, 1.21) | 0.06 |
Fourth quartile compared with less than or equal to the median | Adjusted3 | 1.21 (1.14, 1.26) | 0.05 |
Pumping frequency as continuous exposure | |||
Pumping episodes in previous 2 wk,4 n | Unadjusted | 1.10 (1.06, 1.14) | <0.0001 |
Pumping episodes in previous 2 wk,4 n | Adjusted5 | 1.082 (1.078, 1.084) | <0.0001 |
HM, human milk.
In all models, survival analyses were used to compare the survival of exclusive HM feeding between the frequency group of interest and the comparison group.
Full models were adjusted for mothers' race/ethnicity (white, black, Asian/Pacific Islander, Hispanic, or other), BMI category (normal weight, overweight, or obese), hours worked per week on return to work (0, 1–19, 20–34, or ≥35), timing of their pumping episode, whether mothers' most-used pumps were new or used, and mothers’ level of satisfaction with their most-used pump (high compared with low-to-medium).
HRs are presented for an increase of 10 pumping episodes in the previous 2 wk. This number of pumping episodes was chosen to reflect one additional pumping episode per workday for 2 full work weeks.
Full models were adjusted for mothers' race/ethnicity (white, black, Asian/Pacific Islander, Hispanic, or other), BMI category (normal weight, overweight, or obese), hours worked per week on return to work (0, 1–19, 20–34, or ≥35), timing of the first pumping episode, whether mothers' most-used pumps were new or used, and mothers’ level of satisfaction with their most-used pump (high compared with low-to-medium).