Table 2. Acoustic characteristics in the different phases of the menstrual cycle with results of statistical tests.
Cycle Phase | |||||||||
Acoustic Variable | Follicular | Pre-Ovul | Ovulatory | Luteal | Menstr. | F | P | Partial Eta2 | Observed Power |
Fundamental frequency | 213±3 | 212±3 | 211±3 | 214±3 | 214±4 | 0.90 | 0.464 | 0.011 | 0.285 |
F0 maximum | 252±4 | 251±4 | 249±5 | 254±4 | 256±5 | 1.63 | 0.165 | 0.020 | 0.502 |
F0 minimum | 185±3 | 185±3 | 185±3 | 187±3 | 185±3 | 0.35 | 0.840 | 0.005 | 0.131 |
F0 SD | 5.3±0.3 | 5.4±0.3 | 5.0±0.2 | 5.5±0.3 | 5.6±0.4 | 1.32 | 0.262 | 0.017 | 0.412 |
Degree of unvoiceness | 8.2±0.9 | 8.0±0.9 | 7.2±0.6 | 7.1±0.8 | 9.1±1.1 | 2.89 | 0.022 | 0.036 | 0.779 |
Noise-to-harmonic ratio | 0.139±0.004 | 0.138±0.004 | 0.132±0.003 | 0.141±0.005 | 0.147±0.007 | 2.50 | 0.042 | 0.031 | 0.710 |
Shimmer | 4.3±0.3 | 4.6±0.3 | 4.2±0.2 | 4.3±0.3 | 4.5±0.3 | 0.86 | 0.487 | 0.011 | 0.274 |
Jitter | 2.1±0.1 | 2.1±0.2 | 1.9±0.1 | 2.0±0.1 | 2.1±0.2 | 1.85 | 0.119 | 0.023 | 0.559 |
Mean and s.e.m for N = 23 women and results of the statistical analysis the effect of cycle phase on different acoustic variables.
GLM with subject and vowel as random factor, and menstrual cycle phase as fixed factor; df = 4,313 for all analyses. Partial Eta2 provides an overestimate of the actual effect size; observed power gives the probability that the test statistic is greater than the critical value under the alternative hypothesis.