Validation of Measures of Satisfaction with and Impact of Continuous and Conventional Glucose Monitoring DIABETES TECHNOLOGY & THERAPEUTICS Hirsch, I. B., Gilliam, L. K., Fitzpatrick, K., Khakpour, D., Weinzimer, S. A., Tamborlane, W. V., Ives, B., Bosson-Heenan, J., Wolpert, H., Shetty, G., Atakov-Castillo, A., Giusti, J., O'Donnell, S., Ghiloni, S., Bode, B. W., O'Neil, K., Tolbert, L., Wysocki, T., Fox, L. A., Mauras, N., Englert, K., Permuy, J., Buckingham, B., Wilson, D. M., Block, J., Benassi, K., Tsalikian, E., Tansey, M., Kucera, D., Coffey, J., Cabbage, J., Laffel, L., Milaszewski, K., Pratt, K., Bismuth, E., Keady, J., Lawlor, M., Chase, H. P., Fiallo-Scharer, R., Wadwa, P., Messer, L., Gage, V., Burdick, P., Lawrence, J. M., Clemons, R., Maeva, M., Sattler, B., Beck, R. W., Ruedy, K. J., Kollman, C., Xing, D., Sibayan, J., Steffes, M., Bucksa, J. M., Nowicki, M. L., Van Hale, C., Makky, V., O'Grady, M., Huang, E., Basu, A., Meltzer, D. O., Zhao, L., Lee, J., Kowalski, A. J., Laffel, L., Tamborlane, W. V., Beck, R. W., Kowalski, A. J., Ruedy, K. J., Weinstock, R. S., Anderson, B. J., Kruger, D., Lavange, L., Rodriguez, H., Cheng, J. 2010; 12 (9): 679-684

Abstract

The evaluation of patient-reported outcomes (e.g. impact, satisfaction) is important in trials of continuous glucose monitoring (CGM). We evaluated psychometric properties of the CGM Satisfaction Scale (CGM-SAT) and the Glucose Monitoring Survey (GMS).CGM-SAT is a 44-item scale on which patients (n=224) or parents (n=102) rated their experience with CGM over the prior 6 months. GMS is a 22-item scale on which patients (n=447) or parents (n=221) rated the blood glucose monitoring system they were using (home glucose meter with or without CGM) at baseline and 6 months.The alpha coefficient for the CGM-SAT was > or = 0.94 for all respondents and for the GMS was > or = 0.84 for all respondents at baseline and 6 months. Parent-youth agreement was 0.52 for the CGM-SAT at 6 months and 0.24 and 0.20 for the GMS at baseline and 6 months for the Standard Care Group, respectively. Test-retest reliability of the GMS at 6 months for controls was r=0.76 for adult patients, 0.63 for pediatric patients, and 0.43 for parents. Factor analysis isolated measurement factors for the CGM-SAT labeled Benefits of CGM and Hassles of CGM, accounting for 33% and 9% of score variance, respectively. For the GMS, two factors emerged: Glucose Control and Social Complications, accounting for 28% and 9% of variance, respectively. Significant correlations of CGM-SAT with frequency of CGM use between 6 months and baseline and GMS with frequency of conventional daily self-monitoring of blood glucose at baseline support their convergent validity.The CGM-SAT and GMS are reliable and valid measures of patient-reported CGM outcomes.

View details for DOI 10.1089/dia.2010.0015

View details for Web of Science ID 000280883100001

View details for PubMedID 20799388

View details for PubMedCentralID PMC3045572