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Table 4 Number of completed questionnaires, questionnaire precision (person separation and person reliability) and targeting

From: Catquest-9SF functioning over a decade – a study from the Swedish National Cataract Register

Year N (completed questionnaires) Person separation Person reliability Targeting: person mean score (item = 0)
2008 1690 2.57 0.87 −1.92
2009 6046 2.67 0.88 −1.87
2010 7630 2.68 0.88 −1.81
2011 7028 2.72 0.88 −1.69
2012 7432 2.61 0.87 −1.87
2013 7332 2.54 0.87 −2.07
2014 9202 2.58 0.87 −2.08
2015 8968 2.57 0.87 −2.10
2016 8944 2.54 0.87 −2.19
2017 10,624 2.55 0.87 −2.16
2018 9150 2.45 0.86 −2.31