Table 5.
Characteristics of the infants grouped per vial in which oxytocin was measured
| Group characteristics | Vial 1 Mean (SD) | Vial 2 Mean (SD) | Vial 3 Mean (SD) |
|---|---|---|---|
| Age (weeks) | 35.8 (1.1) | 35.3 (1.1) | 35.1 (1.5) |
| Weight (g) | 2249 (270) | 2386 (329) | 2270 (352) |
| Gestational age (weeks) | 32.1 (3.2) | 31.3 (3.4) | 31.0 (2.3) |
| Birthweight (g) | 1716 (421) | 1796 (537) | 1606 (406) |
| Number of days after birth | 25.8 (25.3) | 27.7 (26.7) | 28.9 (23.0) |
| Number of caesarean sections | 5 | 5 | 6 |
| Kangaroo care duration (min) | 44 (20) | 39 (27) | 51 (16) |
| Ml feeding before collection 1 | 39.4 (12.6) | 40.5 (15.0) | 44.5 (5.5) |
| Ml breastmilk thereof | 28.9 | 18.5 | 36.0 |
| Ml ingested through sucking | 3.5 | 0.1 | 17.4 |
| Ml actually fed per breast | 0.0 | 0.0 | 3.0 |
| Time since feeding (min) | 19.1 (4.3) | 22.8 (7.6) | 21.2 (7.0) |
| Ml feeding before collection 2 | 39.4 (12.6) | 40.5 (15.0) | 45.0 (5.8) |
| Ml breastmilk thereof | 32.4 | 24.0 | 36.5 |
| Ml ingested through sucking | 12.2 | 11.2 | 17.1 |
| Ml actually fed per breast | 7.7 | 5.6 | 3.6 |
| Time since feeding (min) | 21.0 (4.0) | 23.0 (7.8) | 21.0 (6.1) |
| Maternal OT response (pg/mL) | +0.6 (1.2) | +0.2 (0.9) | +0.1 (1.6) |
| First collection intolerance | 1.4 (0.1) | 1.5 (0.1) | 0.9 (0.1) |
| Second collection intolerance | 0.9 (0.1) | 1.2 (0.1) | 1.0 (0.1) |
| Tolerance increase (1–2) | 0.5 | 0.3 | −0.1 |
| First interaction intensity | 1.0 (0.1) | 1.4 (0.1) | 0.4 (0.1) |
| Second interaction intensity | 2.8 (0.1) | 2.3 (0.1) | 2.3 (0.1) |
| Intensity increase (2–1) | 1.8 | 0.9 | 1.9 |
SD = standard deviation; OT = oxytocin.
Bold value: If group 2 is not in between group 1 and 3, AND (only if it is a collection‐dependent variable) the value of group 2 is in between 1 and 3 before Kangaroo care but not anymore during Kangaroo care.