Volume of milk per expression (g) for different pumping regimes (shown in figure 2), mean difference estimates from a linear mixed model (g) (95% CI, p value)
| Number of expressions per day | 4 | 5 | 6 | 7 | 8 | 9 |
| 3 | 11.5 (−3 to 26.0, 0.226) | 12.8 (− 1.2 to 6.9, 0.097) | 17.9 (3.4 to 32.4, 0.005) | 26.9 (11.9 to 41.8,<0.001) | 30.1 (13.6 to 46.7,<0.001) | 35.8 (14.4 to 57.3,<0.001) |
| 4 | 1.4 (−7.6 to 10.4, 0.999) | 6.5 (−3.8 to 16.7, 0.509) | 15.4 (4.5 to 26.2,<0.001) | 18.6 (5.7 to 31.4,<0.001) | 24.4 (5.5 to 43.2, 0.003) | |
| 5 | 5.1 (−0.7 to 10.7, 0.124) | 14.0 (7.2 to 20.8,<0.001) | 17.2 (7.6 to 26.8,<0.001) | 23.0 (6.1 to 39.8, 0.001) | ||
| 6 | 8.9 (4.7 to 13.1,<0.001) | 12.2 (4.0 to 20.3, 0.003) | 17.9 (1.9 to 33.8, 0.017) | |||
| 7 | 3.2 (−4.4 to 10.9, 0.878) | 9.0 (−6.5 to 24.4, 0.609) | ||||
| 8 | 5.7 (−10.9 to 22.4, 0.950) |