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Number of cleanings and period of use.
| Variables | IF instruments (n = 8) | Intact instruments (n = 61) | P-value |
|---|---|---|---|
| Number of washes (n), median [IQR] | 281 [261–323] | 261 [179–320] | 0.27 |
| Use period (year), median [IQR] | 7 [6–8] | 7 [4–8] | 0.90 |
IF insulation failure, IQR interquartile range.
