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Table 2 Time-dependent changes in Simplified Oral Hygiene Index (OHI-S) scores

From: Clinical and radiographic performance of preformed zirconia crowns and stainless-steel crowns in permanent first molars: 18-month results of a prospective, randomized trial

Month

Simplified Oral Hygiene Index (OHI-S) Scores

Median (interquartile range)

Baseline

1.50(1.4–1.8)

1st month

1.25(1.1–1.8)

6th month

1.35(1.1–1.5)

12th month

1.30(1.1–1.6)

18th month

1.40(1.2–1.5)

p*

0.193

  1. *Repeated Simplified Oral Hygiene Index (OHI-S) Scores were compared using Friedman test