In this study, state and trait anxiety were assessed using the Spielberger's State-Trait Anxiety Inventory-form Korean YZ (STAI-KYZ) [15]. State and trait anxiety are analysed with 20 questions, and a higher score signifies a higher level of anxiety. The coefficient of reliability of the STAI-KYZ calculated for state and trait anxiety was Cronbach's α = .92. In this study, the coefficient of reliability for state anxiety was Cronbach's α = .95 and for trait anxiety was Cronbach's α = .94. The Visual Analogue Scale (VAS) was used to measure the state anxiety periodically. VAS lets the subjects self-ascribe anxiety levels between 0 and 10 on a 10 cm horizontal line, with a higher score indicating a higher level of anxiety.
Blood pressure (BP) was measured using the Sure V24 patient monitor (Phillips, USA, 2004). The left brachium of the subject was raised to the heart level, the lower end of the cuff was strapped 2 cm anterior to the elbow, and measurements were taken according to the instrumental procedure. The BP was recorded in mmHg units. BP was measured once before PCI and 13 times after the procedure, for a total of 14 measurements.
Sleep quality was measured using the Korean translation form [16] of VSH Sleep Scale [17]. This tool consists of 8 questions about 4 sleep characteristics based on sleeping time, sleep disturbance, sleep onset, and sleep soundness, each scored on a 10-point scale, with a resulting total range between 0 point and 80 points. A higher score indicates more satisfied sleep, and the coefficient of reliability of the VSH sleep scale was Cronbach's α = .80 in their results [16]. In this study, the coefficient of reliability for preprocedure sleep was Cronbach's α = .86 and for postprocedure sleep was Cronbach's α = .94.
In this study, state and trait anxiety were assessed using the Spielberger's State-Trait Anxiety Inventory-form Korean YZ (STAI-KYZ) [15]. State and trait anxiety are analysed with 20 questions, and a higher score signifies a higher level of anxiety. The coefficient of reliability of the STAI-KYZ calculated for state and trait anxiety was Cronbach's α = .92. In this study, the coefficient of reliability for state anxiety was Cronbach's α = .95 and for trait anxiety was Cronbach's α = .94. The Visual Analogue Scale (VAS) was used to measure the state anxiety periodically. VAS lets the subjects self-ascribe anxiety levels between 0 and 10 on a 10 cm horizontal line, with a higher score indicating a higher level of anxiety.Blood pressure (BP) was measured using the Sure V24 patient monitor (Phillips, USA, 2004). The left brachium of the subject was raised to the heart level, the lower end of the cuff was strapped 2 cm anterior to the elbow, and measurements were taken according to the instrumental procedure. The BP was recorded in mmHg units. BP was measured once before PCI and 13 times after the procedure, for a total of 14 measurements.Sleep quality was measured using the Korean translation form [16] of VSH Sleep Scale [17]. This tool consists of 8 questions about 4 sleep characteristics based on sleeping time, sleep disturbance, sleep onset, and sleep soundness, each scored on a 10-point scale, with a resulting total range between 0 point and 80 points. A higher score indicates more satisfied sleep, and the coefficient of reliability of the VSH sleep scale was Cronbach's α = .80 in their results [16]. In this study, the coefficient of reliability for preprocedure sleep was Cronbach's α = .86 and for postprocedure sleep was Cronbach's α = .94.
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