Tapered, Double-Lead Threads Single Implants Placed in Fresh Extraction Sockets and Healed Sites of the Posterior Jaws: A Multicenter Randomized Controlled Trial with 1 to 3 Years of Follow-Up

Table 1

Patients distribution.

	Test	Control		All patients
Gender
Males	21 (43.8%)	22 (50.0%)	0.676	43
Females	27 (56.2%)	22 (50.0%)		49
Age
20–39	12 (25.0%)	10 (22.7%)	<0.001	22
40–59	31 (64.6%)	14 (31.8%)		45
60–79	5 (10.4%)	20 (45.6%)		25
Smoking habit
Yes	7 (14.6%)	8 (18.2%)	0.779	15
No	41 (85.4%)	36 (81.8%)		77
All patients	48	44	—	92

= Fisher exact test. = patients with ≤20 cigarettes/day were included in the study, conversely patients smoking >20 cigarettes/day were excluded from the study.