Table 5.
Multilevel linear mixed models reveal the relationship between menstrual phase, covariates, and respiratory rate.
| Predictors | Model 1a | Model 2a | Model 3a | Model 4a | Model 5a | Model 6a | Model 7a | Model 8a | Model 9a | |
| Intercept | 16.89b (0.14) | 15.39b (0.97) | 16.91b (0.14) | 16.92b (0.14) | 16.92b (0.14) | 16.88b (0.14) | 17.82b (1.28) | 16.88b (0.17) | 16.15b (1.72) | |
| Cycle phase | ||||||||||
|
|
Menstrual | Reference group | Reference group | Reference group | Reference group | Reference group | Reference group | Reference group | Reference group | Reference group |
| Follicular | –0.38b (0.04) | –0.39b (0.05) | –0.38b (0.04) | –0.38b (0.04) | –0.38b (0.04) | –0.38b (0.05) | –0.38b (0.05) | –0.38b (0.04) | –0.39b (0.05) | |
| Fertile | –0.48b (0.04) | –0.48b (0.04) | –0.47b (0.04) | –0.48b (0.04) | –0.46b (0.04) | –0.48b (0.04) | –0.47b (0.04) | –0.47b (0.04) | –0.46b (0.04) | |
| Early luteal | –0.21b (0.04) | –0.22b (0.04) | –0.21b (0.04) | –0.21b (0.04) | –0.21b (0.04) | –0.21b (0.04) | –0.21b (0.04) | –0.21b (0.04) | –0.21b (0.04) | |
| Late luteal | 0.21b (0.03) | 0.21b (0.03) | 0.22b (0.03) | 0.22b (0.03) | 0.22b (0.03) | 0.21b (0.03) | 0.22b (0.03) | 0.22b (0.03) | 0.22b (0.03) | |
| Mealc | ||||||||||
|
|
Small or no food | Reference group | —d | — | — | — | — | — | — | Reference group |
| Medium meal | 0.00 (0.02) | — | — | — | — | — | — | — | –0.01 (0.02) | |
| Large meal | 0.09b (0.02) | — | — | — | — | — | — | — | 0.04e (0.02) | |
| Body mass index (kg/m2) | — | 0.07 (0.04) | — | — | — | — | — | — | 0.06 (0.04) | |
| Coffeec | — | — | .06e (0.02) | — | — | — | — | — | 0.03 (0.02) | |
| Exercisec | ||||||||||
|
|
No exercise | — | — | — | Reference group | — | — | — | — | Reference group |
| <60 min | — | — | — | –0.01 (0.02) | — | — | — | — | –0.01 (0.02) | |
| >60 min | — | — | — | 0.03 (0.02) | — | — | — | — | 0.03 (0.02) | |
| Sexual intercoursec | — | — | — | — | –0.04e (0.01) | — | — | — | –0.05b (0.02) | |
| Alcoholc | ||||||||||
|
|
No alcohol | — | — | — | — | — | Reference group | — | — | Reference group |
| 1-4 units | — | — | — | — | — | 0.11b (0.01) | — | — | 0.10b (0.01) | |
| >5 units | — | — | — | — | — | 0.48b (0.04) | — | — | 0.46b (0.04) | |
| Age (years) | — | — | — | — | — | — | –0.03 (0.04) | — | –0.02 (0.04) | |
| Cycle duration | — | — | — | — | — | — | — | 0.00 (0.00) | 0.00 (0.00) | |
aUnstandardized b-coefficient values reported, with SEs in parentheses.
bP<.001 with a Bonferroni correction.
cWithin the 3 hours preceding the onset of sleep.
dIndicates a predictor was not considered in a given model.
eP<.05 with a Bonferroni correction.