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Table 7 Convergent construct validity of the LTCQ and the LTCQ-8 with independent measures (Spearman’s rho)

From: Rasch analysis of the long-term conditions questionnaire (LTCQ) and development of a short-form (LTCQ-8)

Measure Mean score (SD, SE, 95% CI) Score range Correlation with LTCQ Correlation with LTCQ-8
LTCQ 65.10 (23.04, 0.70, 63.7–66.5) 0–100 0.97***
LTCQ-8 65.01 (25.13, 0.74, 63.6–66.5) 0–100 0.97***
EQ-5D-5L 0.62 (0.33, 0.01, 0.60–0.63) − 0.28–1.00 0.82*** 0.80***
EQ-VAS 62.40 (24.65, 0.72, 61.0–63.8) 0–100 0.79*** 0.77***
Lorig self-efficacy scale 6.22 (2.71, 0.08, 6.1–6.4) 1–10 0.87*** 0.84***
Activities of daily living 4.98 (4.76, 0.14, 4.7–5.3) 0–13 − 0.79*** − 0.77***
Bayliss burden of morbidity 16.44 (13.10, 0.38, 15.7–17.2) 0–150 − 0.64*** − 0.61***
  1. ***Correlation is significant at p < 0.001 (2-tailed)