Data quality indicators for daily life chart methodology: prospective self-ratings of bipolar disorder and alcohol use

Table 2 Descriptives of quality indicators

Indicator	Compliance		Consistency			Reactivity
Operationalisation	Average observation length (SD)	Average % missings (SD)	Average Spearman’s rank order correlation LC depression-CGI expert (SD)	Average Spearman’s rank order correlation LC mania-CGI expert (SD)	Average Spearman’s rank order correlation LC mood-LC severity (SD)	Average alcohol consumption week 1 minus week 4 (SD)
Raw average	347 days (90) range: 60–529	1.6 (4.2)*	rho = 0.61 (0.35) N = 122***	rho = 0.63 (0.45) N = 105***	rho = 0.70 (0.28) N = 134	Mean difference no. of drinks 0.15 (1.59)** range: −3.71 to 11.29
Quality indicator average (between 0 and 1)	0.61 (0.19)	0.98 (0.04)	0.80 (0.17)	0.82 (0.22)	0.85 (0.14)	0.74 (0.11)

Number of cases is 137, unless stated otherwise
* N = 48 (35 %) had missing data points
** 51 patients had more drinks in week 4 than in week 1, with a maximum of 3.71 more (sum: 44.29). Also, 51 patients drank less in week 4, but with a maximum of 11.29 less (sum: 64.98). Thus, the difference in a reactive direction—drinking less as a result of reporting alcohol consumption—is higher
*** No correlations could be established in cases where one of the two series of values was constant; this was often the case

ISSN: 1756-0500