Table 2.
Human milk and salivary cortisol (raw and log-transformed) and human milk IgA1.
| 1 week (N = 24) | 5 weeks (N = 17) | Mean difference (N = 17) | P-value2 | |
|---|---|---|---|---|
| Cortisol | ||||
| Human milk cortisol | 1.93 ng/mL (range 0.12–6.52, SD 1.97) | 6.02 ng/mL (range 1.1–15.3, SD 3.9) | Mean 4.05 (range −0.6–14.74) | p < 0.001* |
| Human milk cortisol, log-transformed | 0.10 (range −2.09–1.88, SD 1.19) | 1.57 (range 0.09–2.73, SD 0.697) | 0.0001* | |
| Maternal salivary cortisol | 2.25 ng/mL (range 0.04–9.24, SD 2.35) | 2.43 ng/mL (range 0.48–6.86, SD 1.76) | Mean −0.13 (range −5.37–3.76) | 0.8 |
| Maternal salivary cortisol, log-transformed | 0.117 (range −3.22–2.22, SD 1.52) | 0.56 (range −0.798–1.925) | 0.17 | |
| IgA | ||||
| Breastmilk IgA | 1.13 mg/mL (range 0.42–1.91, SD 0.47) | 0.89 mg/mL (range 0.25–1.86, SD 0.45) | −0.145 mg/mL (range −0.86–0.89, SD 0.53) | <0.0001* |
*Statistically significant. 1HM and salivary cortisol was measured using chemiluminescent immunoassay, and IgA was measured using customized immunoassay in skim milk. 2For comparison over time.