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Table 4 Internal Consistency and Factor Analysis Tests with Baseline, 6-month, and 12-month Data

From: Psychometrics of the self-efficacy for physical activity scale among a Latina women sample

  Original Scale (Baseline) Collapsed Scale (Baseline)
All Five Items Vacation Dropped All Five Items Vacation Dropped
Cronbach’s Alpha .72 (95% CI .62–.82) .70 (95% CI .58–.82) .71 (95% CI .61–.81) .67 (95% CI .54–.79)
Highest Factor Loading: Item 1 (Tired) .72 .80 .68 .77
Lowest Factor Loading: Item 4 (Vacation) .54 .63
  Original Scale (6-months) Collapsed Scale (6-months)
All Five Items Vacation Dropped All Five Items Vacation Dropped
Cronbach’s Alpha .76 (95% CI .67–.85) .78 (95% CI .68–.88) .76 (95% CI .67–.85) .75 (95% CI .64–.86)
Highest Factor Loading: Item 1 (Tired) .86 .94 .81 .87
Lowest Factor Loading: Item 4 (Vacation) .4 .54
  Original Scale (12-months) Collapsed Scale (12-months)
All Five Items Vacation Dropped All Five Items Vacation Dropped
Cronbach’s Alpha .78 (95% CI .69–.87) .80 (95% CI .70–.90) .78 (95% CI .69–.87) .79 (95% CI .69–.89)
Highest Factor Loading: Item 1 (Tired) .89 .95 .92 .97
Lowest Factor Loading: Item 4 (Vacation) .42 .42