Table 1.

Demographic and clinical features of groups

Group	Mean age	Gender	Number of nodules (%)		Nodule size (%)		Nodule localization (%)
	mean ± SD	(F/M ratio)	single	two or more	20 mm↓	20 mm↑	right	left	bilateral
A (n = 20)	45.1 ±12.34	12/8	40	60	70	30	25	15	60
B (n = 20)	57.9 ±13.57	14/6	–	100	25	75	–	–	100
C (n = 20)	49.70 ±12.49	17/3	45	55	60	40	20	25	55
A + B + C (n = 60)	50.93 ±13.68	43/17	28.30	71.70	51.70	48.30	15	13.30	71.70
control (n = 20)	48.05 ±11.91	15/5