Is Low Serum Vitamin D Associated with Early Dental Implant Failure? A Retrospective Evaluation on 1625 Implants Placed in 822 Patients

Table 1

Distribution of patients (by gender, age at surgery, smoking habit, history of periodontal disease, and vitamin D levels in serum), related failures, survival rate within groups, and differences between groups (Chi square test).

	Number of patients	Early failures	Incidence of early failures	value
Gender
Males	424	14	3.3%	0.97
Females	398	13	3.2%
Age at surgery
<40 years	92	3	3.2%	0.98
40–60 years	380	12	3.1%
>60 years	350	12	3.4%
Smoking habit
Yes	261	10	3.8%	0.56
No	561	17	3.0%
History of periodontal disease
Yes	279	10	3.5%	0.73
No	543	17	3.1%
Vitamin D level in serum
<10 ng/mL	22	2	9.0%	0.15
10–30 ng/mL	406	16	3.9%
>30 ng/mL	394	9	2.2%

Statistically significant difference .
value = Chi square test.