| Characteristics | N | Calcium (mg/dl) Mean ± SD | Statistics | |
| Coefficient | P-Value | |||
| Duration of Smoking Habit <5 years ≥5 years |
21 9 |
7.24 ± 0.74 7.50 ± 0.76 | t, −0.846 | 0.405 |
| Frequency of Smoking Always Occasionally Rarely |
4 11 15 |
7.52 ± 0.43 7.27 ± 0.66 7.30 ± 0.88 | F, 0.166 | 0.848 |
| Smoking Intensity <5 sticks per day ≥5 sticks per day |
28 2 |
7.34 ± 0.75 7.05 ± 0.78 | t, 0.530 | 0.600 |