Unadjusted | P value | Age and sex adjusted | P value | |
Predominant | ||||
Incidence of fissures (OR (95% CI))* | 1.144 (1.061 to 1.233) | <0.001 | 1.147 (1.055 to 1.246) | 0.001 |
Length of fissures (µm) (R)† | 0.403 | <0.001 | 0.417 | <0.001 |
Area of fissures (mm^{2}) (R)‡ | 0.400 | <0.001 | 0.391 | <0.001 |
Medial | ||||
Incidence of fissures (OR (95% CI))* | 1.173 (1.081 to 1.273) | <0.001 | 1.186 (1.081 to 1.302) | <0.001 |
Length of fissures (µm) (R)† | 0.463 | <0.001 | 0.507 | <0.001 |
Area of fissures (mm^{2}) (R)‡ | 0.467 | <0.001 | 0.518 | <0.001 |
Lateral | ||||
Incidence of fissures (OR (95% CI))* | 1.086 (1.017 to 1.159) | 0.013 | 1.078 (1.004 to 1.157) | 0.038 |
Length of fissures (µm) (R)† | 0.264 | 0.013 | 0.240 | 0.027 |
Area of fissures (mm^{2}) (R)‡ | 0.286 | 0.007 | 0.224 | 0.040 |
*Logistic regression between BMI (kg/m^{2}, continuous variable) and incidence of fissures.
†Spearman’s rank correlation analysis between BMI (kg/m^{2}) and the length of fissures (µm).
‡Spearman’s rank correlation analysis between BMI (kg/m^{2}) and the area of fissures (mm^{2}).