International validation of the EORTC QLQ-PRT20 module for assessment of quality of life symptoms relating to radiation proctitis: a phase IV study

Table 5 Test – retest reliability from Time 1 (2 weeks before treatment) to Time 2 (week of treatment), ICC and Spearman’s Rho; multi-item scales linear transformed data, single item scales raw data

QLQ-PRT20 Scales [range], n	T1 Mean(SD) [range]	T2 Mean(SD) [range]	ICC of proposed scale** or kappa	T1 –T2 Spearman’s Rho or Phi
Bowel Control [0–100], 329	8.95(15.43) [0–83]	10.18(15.60) [0–100]	0.77	0.68*
Bloating and Gas [0–100], 329	6.35(14.19) [0–73]	7.58(13.83) [0–75]	0.61	0.67*
Emotional Function/Lifestyle [0–100], 328	9.55(13.65) [0–67]	11.56(14.75) [0–83]	0.74	0.62*
Pain [0–100], 329	5.17(12.32) [0–89]	5.51(11.56) [0–78]	0.76	0.64*
Leakage [0–100], 329	4.68(12.77) [0–100]	5.72(13.14) [0–100]	0.67	0.48*
Diarrhoea Medication^a [yes/no], 325	Yes = 8	Yes = 13	0.30 ^k	0.31^P*
Bowel openings in 24 h^a [0 +], 316	2.26(2.23) [0–25]	2.47(1.96) [1–20]	0.72	0.70*
Requesting more assistance^a [yes/no], 304	Yes = 33	Yes = 29	0.57 ^k	0.57^P*

^a Single item scales raw data, k = kappa, p = Phi, * p < .01, ** linear transformed data

ISSN: 1748-717X