Table 2.
Correlations used to determine factors for linear regression.
| Factor | Pearson correlation | p value | Factor | Pearson correlation | p value |
|---|---|---|---|---|---|
| Age | .214 | < .01 * | Laryngeal procedure | .073 | .083 |
| Diagnosis | .276 | < .042 * | Maximal f o | −.069 | .149 |
| Behavioral health diagnosis | −.202 | .016 * | Minimal f o | .093 | .062 |
| Dysphonia Severity Index | −.291 | < .01 * | Mean glottal airflow | .098 | .078 |
| Glottal airflow | .222 | < .01 * | Maximum phonation time | .033 | .489 |
| Overall GRBAS | .529 | < .01 * | Noise-to-harmonic ratio | .102 | .117 |
| Occupational voice user status | .282 | < .01 * | Onset type (gradual, sudden) | .029 | .569 |
| Phonation threshold pressure | .343 | .006 * | Increased vocal effort | .085 | .098 |
| Voice Handicap Index | .248 | < .01 * | % reduced voice use | .062 | .207 |
| Allergies | −.091 | .032* | Reflux (patient report) | −.063 | .138 |
| Asthma | −.082 | .054 | Reflux Severity Index | −.064 | .136 |
| Dyspnea | −.102 | .017* | Returned following discharge | .163 | < .01* |
| Dysphagia | −.038 | .380 | Schedule (weekly, other) | .195 | < .01* |
| Employment status | .030 | .473 | Sex | .105 | .415 |
| f o range | .026 | .547 | Shimmer | .157 | < .01* |
| Glottal Function Index | .058 | .232 | Subglottal pressure | .098 | .078 |
| Globus | −.067 | .203 | Time since onset | .025 | .558 |
| Glottic closure pattern | .065 | .183 | Throat clearing/ cough | −.021 | .622 |
| Glottal vibratory characteristics | .075 | .652 | Voice Handicap Index (Emotional) | .043 | .313 |
| Jitter | .026 | .587 | Voice Handicap Index (Functional) | .061 | .155 |
| Laryngeal airway resistance | .082 | .143 | Voice Handicap Index (Physical) | .062 | .147 |
| Laryngeal hyperfunction | .111 | .039* | Years smoked | −.021 | .630 |
Note. Bolded font indicates that factor was included in linear regression. f o = fundamental frequency; GRBAS = grade, roughness, breathiness, asthenia, strain.
*
Indicates statistical significance at p < .05.