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. Author manuscript; available in PMC: 2017 Jul 1.
Published in final edited form as: Nurs Res. 2016 Jul-Aug;65(4):279–289. doi: 10.1097/NNR.0000000000000162

TABLE 2.

Reliability Estimates for PROMIS F-SF Total Scores

Estimate FMS SCD CMR Pregnancy HC
α .76 .83 .85 .72 .88
95% CI [.67, .84] [.76, .89] [.80, .91] [.63, .82] [.83, .94]
α (if item deleted)
 Q1: feel tired .75 .79 .83 .70 .86
 Q2: extreme  exhaustion .69 .79 .84 .66 .86
 Q3: out of energy .66 .78 .81 .62 .85
 Q4: limits work .70 .79 .83 .67 .85
 Q5: think clearly .71 .79 .81 .66 .85
 Q6: bathe/shower .75 .81 .85 .69 .87
 Q7: strenuous exercise .81 .88 .86 .79 .91

Note. Reliability estimates using Cronbach’s alpha; 95% CIs were calculated using the method of Lacobucci and Duchachek (2003). CI = confidence interval; CMR = cardiometabolic risk; FMS = fibromyalgia; HC = healthy controls; SCD = sickle cell disease.