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Table 1 Comparison of mean values of actual age and predicted age in both groups

From: Age estimation with cemental incremental lines in normal and periodontally diseased teeth using phase contrast microscope: an original research

Group N Actual age Estimated age Mean difference in age
Mean SD Mean SD Mean SD t value p value
Normal teeth 30 27.833 5.9659 28.903 6.1250 − 1.07 1.7 − 3.442 0.002**
Periodontally compromised teeth 30 39.367 8.4261 40.393 8.4818 − 1.02 1.67 − 3.354 0.002**
  1. **Statistically highly significant (p<0.01)