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. 2009 Aug 26;2(2):25–31. doi: 10.5005/jp-journals-10005-1026

TABLE 5: Significance of correlation between grades of fluorosis and DMFT for different age groups

S. no          Age group          t cal          t tab          P value
1          Group I (8-9 years)          –23.5931**                            P << 0.05
         P << 0.05
2          Group II (9-10 years)          –19.29          t (0.05) = 1.962          Significant
3          Group III (10-11 years)          –10.38          t (0.01) = 2.58          Significant
4          Group IV (11-12 years)          –16.8053                            Significant
5          Group V (12-13 years)          –9.3444*                            P << 0.05
         P << 0.05
6          Group VI (13-14 years)          –12.9369                            Significant
** = Highly significant, * = Significant, at 5% and 1% level of significance