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Table 1 Vickers microhardness values (VHN) of all studied groups and percent difference between each test and its control subgroup

From: Preventive potential of nano silver fluoride versus sodium fluoride varnish on enamel caries like lesions in primary teeth: in vitro study

  NSF (subgroup Ia)
(n = 24)
FV (subgroup IIa)
(n = 24)
Ia (test)
(n = 12)
Ib (control)
(n = 12)
IIa (test)
(n = 12)
IIb (control)
(n = 12)
Mean ± SD 312.75 ± 26.35 301.50 ± 26.95 309.27 ± 22.53 293.69 ± 23.24
Paired t test (P value) 6.40 (< 0.001*) 5.35 (< 0.001*)
Independent t test (P value) 0.347 (0.73)
Percent increase     
 Median 3.23 4.17
 IQR 2.54–4.39 3.18–6.37
 MWU (P value) − 1.328 (0.81)
  1. NSF Nano silver fluoride, FV Fluoride varnish, IQR Interquartile range, MWU Mann Whitney U test
  2. *Statistically significant at P value ≤ 0.05