| Item | Classical M (SD) | Popular M (SD) | ||
|---|---|---|---|---|
| Water | 4.09 (0.78) | 3.71 (0.79) | 2.602 | .010 |
| Caffeine | 4.03 (0.75) | 4.00 (0.78) | .247 | .805 |
| Smoking | 4.88 (0.38) | 4.71 (0.58) | 1.868 | .065 |
| Alcohol | 4.48 (0.66) | 4.13 (0.77) | 2.720 | .007 |
| Milk | 4.38 (0.62) | 4.59 (0.61) | –1.860 | .065 |
| Midnight snack | 4.34 (0.72) | 4.27 (0.72) | .573 | .568 |
| Overeat | 3.69 (0.65) | 3.87 (0.64) | –1.564 | .120 |
| Spicy food | 3.84 (0.72) | 3.67 (0.60) | 1.487 | .140 |
| Sleep | 3.83 (0.73) | 3.54 (0.62) | 2.350 | .020 |
| Cough | 4.03 (0.75) | 3.83 (0.66) | 1.632 | .105 |
| Long speaking | 3.79 (0.67) | 3.71 (0.66) | .653 | .515 |
| Shouting | 3.83 (0.70) | 4.06 (0.74) | –1.796 | .075 |
| Whispering | 4.09 (0.80) | 3.68 (0.71) | 2.930 | .004 |
| Speaking in dust | 3.98 (0.69) | 3.87 (0.64) | .913 | .363 |
| Singing in dust | 4.05 (0.71) | 4.02 (0.64) | .293 | .770 |
| Tight cloth | 4.00 (0.75) | 3.98 (0.73) | .118 | .906 |
| Tight cloth on stage | 3.98 (0.74) | 3.94 (0.76) | .339 | .735 |
| Breathing | 3.90 (0.79) | 3.73 (0.65) | 1.269 | .207 |
| Breathing on singing | 4.10 (0.72) | 3.90 (0.76) | 1.480 | .142 |
| Singing within vocal range | 3.84 (0.64) | 3.56 (0.59) | 2.580 | .011 |
| Total | 81.17 (5.35) | 78.78 (5.02) | 2.540 | .012 |