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. 2016 Sep 2;16(1):89. doi: 10.1186/s12903-016-0288-7

Table 1.

Study sample characteristics (mean ± SD or N (%))

Variable	Cases (n = 19)	Controls (n = 19)
Age (y)	47.6 ± 8.7	46.7 ± 8.2
Sex (females/males)	14 (73.7 %)/5 (26.3 %)	14 (73.7 %)/5 (26.3 %)
BMI (kg/m²)	29.5 ± 5.1	29.3 ± 6.0
PD (mm)	2.3 ± 0.4	1.3 ± 0.3^a
AL (mm)	2.6 ± 0.6	1.3 ± 0.4^a
Serum 25 (OH) D (ng/ml)	18.5 ± 4.6	24.2 ± 7.1^b

^aSignificantly different from cases (p < 0.0001; Student’s t-test)

^bSignificantly different from cases (p = 0.006; Student’s t-test)

BMI Body mass index, PD probing depth, AL attachment level