Table 2.

Mokken Scaling for all Teachers.

Total Teachers N = 695
Scale 1	Rho = 0.945	HT = 0.464	Qualified
Question	Mean	HT	Original VFI factor
2. My voice feels tired when I talk more	3.052	0.58	1
4. My voice gets hoarse with voice use	2.790	0.61	1
3. I experience increased sense of effort with talking	2.675	0.58	1
11. My voice feels weak after a period of voice use	2.549	0.67	1
14. My voice feels sore when I talk more	2.537	0.66	2
6. I tend to generally limit my talking after a period of voice use	2.476	0.55	1
5. It feels like work to use my voice	2.456	.64	1
10. I find it difficult to project my voice with voice use	2.442	0.60	1
9. It is effortful to produce my voice after a period of voice use	2.374	0.66	1
13. I experience throat pain at the end of the day with voice use	2.304	0.63	2
15. My throat aches with voice use	2.302	0.65	2
8. I feel I cannot talk to my family after a work day	1.965	0.55	1
12. I experience pain in the neck at the end of the day with voice use	1.863	0.57	2
16. I experience discomfort in my neck with voice use	1.858	0.59	2
17. My voice feels better after I have rested	1.468	0.41	3
19. The hoarseness of my voice gets better with rest	1.449	0.36	3
2. My voice feels tired when I talk more	3.052	0.58	1
4. My voice gets hoarse with voice use	2.790	0.61	1
3. I experience increased sense of effort with talking	2.675	0.58	1
11. My voice feels weak after a period of voice use	2.549	0.67	1
Items disqualified from scaling
Question			Original VFI factor
1. I don’t feel like talking after a period of voice use			1
7. I avoid social situations when I know I have to talk more			1
18. The effort to produce my voice decreases with rest			3