Table 3

Agreement indices to justify aggregation at the unit level

SurveyDimensionrwg(j)ICC(1)ICC(2)Significance of ANOVA
SAQTeamwork0.61−0.03−1NS
SAQSafety0.79*−0.02−0.45NS
HSOPSExpectations0.76*0.020.21NS
HSOPSOrganisational learning0.82*0.010.10NS
HSOPSTeamwork within0.81*−0.03−0.85NS
HSOPSCommunication0.670.0010.02NS
HSOPSFeedback0.73*0.05*0.42NS
HSOPSNon-punitive0.630.05*0.43<0.05*
HSOPSStaffing0.660.09*0.58<0.05*
HSOPSManagement support0.560.010.13NS
HSOPSTeamwork across0.77*−0.02−0.40NS
HSOPSHandoffs0.76*−0.03−0.73NS
HSOPS outcomeEvent reporting0.74*0.08*0.55<0.05*
HSOPS outcomeOverall perceptions0.74*0.26*0.28NS
HSOPS outcomeNo. of events reported0.610.040.37NS
HSOPS outcomeSafety grade0.590.010.14NS
  • *Indicates support for aggregation based on rwg(j) ≥0.70, ICC(1) values between 0.05 and 0.30, ICC(2) values ≥0.70, and a significant one-way ANOVA.

  • ANOVA, analysis of variance; HSOPS, Hospital Survey on Patient Safety Culture; ICC, intraclass correlation coefficient; NS, non-significant; SAQ, Safety Attitudes Questionnaire.