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Table 8 Minimum required sample size for acceptable reliability at the departmental level*

From: The ecometric properties of a measurement instrument for prospective risk analysis in hospital departments

Number of respondents BRF Procedures BRF Training BRF Communication BRF Incompatible Goals BRF Organization
  Reliability coefficient
20 0.54 0.55 0.57 0.38 0.59
25 0.60 0.60 0.62 0.43 0.64
30 0.64 0.65 0.66 0.48 0.69
40 0.70 0.71 0.72 0.55 0.74
50 0.75 0.75 0.76 0.60 0.78
75 0.82 0.82 0.83 0.70 0.84
100 0.86 0.86 0.87 0.75 0.88
125 0.88 0.88 0.89 0.79 0.90
150 0.90 0.90 0.91 0.82 0.92
200 0.92 0.92 0.93 0.86 0.94
250 0.94 0.94 0.94 0.88 0.95
  1. *A reliability coefficient of less than 0.70 is considered below the minimum value for acceptable reliability.