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Table 3 The eigenvectors of the first three factors ordered

From: Caffeine improves work durability and physical performance in anaerobic exercises among active adults in Tripoli Lebanon

  Factor 1 Factor 2 Factor 3
Item6: Workouts are better after having caffeine 0.710 − 0.258 0.311
Item3: Caffeine improves my athletic performance 0.650 − 0.226 0.403
Item13: I would be unable to function without caffeine 0.456 − 0.225 0.263
Item7: Caffeine increases my motivation to work 0.778 − 0.217 0.172
Item15: I can exercise longer if I have caffeine 0.732 − 0.161 0.260
Item5: Caffeine improves my mood 0.693 − 0.146 − 0.075
Item1: Caffeine picks me up when I’m feeling tired 0.654 − 0.122 − 0.342
Item16: Caffeine makes me feel more energetic 0.766 − 0.050 − 0.021
Item14: Caffeine improves my attention 0.790 − 0.023 − 0.146
Item11: Caffeine improves my concentration 0.786 − 0.012 − 0.257
Item4: I feel less sleepy after having caffeine 0.641 0.249 − 0.336
Item10: Caffeine makes me feel more alert 0.702 0.266 − 0.277
Item8: Caffeine at any time throws off my sleep 0.474 0.489 − 0.356
Item12: Caffeine helps me work over long period of time 0.752 0.049 0.038
Item2: I am easily stressed after having caffeine 0.265 0.582 0.592
Item9: Caffeine makes me feel nervous 0.251 0.787 0.299
  1. Extraction method: principal component analysis