Table 3.

Results of item analysis of SMSTP (n = 231)

Dimension	Item (brief description in English)	Mean (SD)	Critical value	Item-total correlation coefficient
Adherence to treatment behavior	Item 1: Medication-taking record card filled	3.97 ± 1.38	0.823	0.060
	Item 2: Taking medications following prescription	4.00 ± 1.29	14.600**	0.676**
	Item 3: Taking medications when going out	3.07 ± 1.39	0.372	0.035
	Item 4: Keeping drugs correctly	3.21 ± 1.46	10.648**	0.603**
	Item 5: Addressing adverse effects of medications correctly	2.94 ± 1.40	12.589**	0.602**
	Item 6: Taking medications consistently	3.14 ± 1.49	13.746**	0.616**
	Item 7: Regularly following-up sputum	2.99 ± 1.45	14.952**	0.661**
Supportive behavior	Item 8: Abstaining from smoking	2.95 ± 1.14	11.471**	0.600**
	Item 9: Abstaining from alcohol drinking	3.16 ± 1.23	10.190**	0.575**
	Item 10: Maintaining adequate sleep	2.90 ± 1.05	10.332**	0.578**
	Item 11: Avoiding overexertion	3.17 ± 1.25	12.533**	0.643**
	Item 12: Keeping proper exercise	2.79 ± 0.91	11.522**	0.620**
	Item 13: Maintaining adequate nutrition	3.19 ± 1.30	11.406**	0.624**
Transmission prevention behavior	Item 14: Not spitting indiscriminately	2.82 ± 0.98	10.505**	0.574**
	Item 15: Reducing frequency of presence in public	3.69 ± 1.05	11.428**	0.735**
	Item 16: Wearing respirator in public during infective phase of disease	4.13 ± 1.21	5.386**	0.407**
	Item 17: Disposing sputum with safe method	3.39 ± 1.21	10.573**	0.653**
	Item 18: Covering face when sneezing/coughing/speaking loudly	3.38 ± 1.17	11.425**	0.685**
	Item 19: Informing contact of TB status	3.24 ± 1.16	9.520**	0.599**
	Item 20: Ventilating their room	3.32 ± 1.16	10.046**	0.595**

SMSTP self-management scale for TB patients; **P < 0.001