Table 2. Distribution of comorbidities.

	Comorbidity	Group 1	Group 2	Total	p -value	Test
No comorbidities	Yes	24	46	24	ns	Chi-squared
	No	12	28	12
Smoking	Yes	4	12	4	ns	Chi-squared
	No	32	62	32
Hypertension	Yes	2	8	2	ns	Chi-squared
	No	34	66	34
Asthma	Yes	0	2	0	ns	Chi-squared
	No	36	72	36
Diabetes	Yes	2	2	2	ns	Chi-squared
	No	34	72	34
Hypothyroidism	Yes	0	2	0	ns	Chi-squared
	No	36	72	36
Depression	Yes	4	2	4	ns	Chi-squared
	No	32	72	32