Table 2 Proportion benefiting from the intervention and number needed to treat in the two included studies
From: Non-surgical treatment of dentin caries in preschool children – systematic review
Study | Intervention (test group) | Caries arrest rate in test group | Caries arrest rate in control group | Proportion benefiting from intervention | Number needed to treat |
|---|---|---|---|---|---|
P (A) | P (B) | P(C) = P(A) - P(B) | NNT = 1/P(C) | ||
Chu et al. 2002 [13] | 38% SDF + excavation | 0.65 | 0.34 | 0.31 | 3.2 |
38% SDF | 0.65 | 0.34 | 0.31 | 3.2 | |
5% NaF + excavation | 0.38 | 0.34 | 0.04 | 25 | |
5% NaF | 0.44 | 0.34 | 0.10 | 10 | |
Lo et al. 1998 [9] | Brushing with fluoridated toothpaste | 0.28 | 0.12 | 0.16 | 6.3 |