Table 2.
The Liverpool jet-lag questionnaire (modified)
| Items and scores | No. of subjects |
|---|---|
| 1. Jet lag: how much jet lag do you have? | |
| Insignificant (from 0 to 3) | 6 |
| Mild jet-lag (from 4 to 7) | 16 |
| Very bad (from 8 to 10) | 6 |
| 2. Last night’s sleep. When compared with normal: | |
| a. How easily did you get to sleep? | |
| Less (from −5 to −1) | 13 |
| Normal 0 | 5 |
| More (from +1 to +5) | 10 |
| b. What time did you get to sleep? | |
| Earlier (from −5 to −1) | 6 |
| Normal 0 | 6 |
| Later (from +1 to +5) | 16 |
| c. How well did you sleep? | |
| More waking episodes (from −5 to −1) | 20 |
| Normal 0 | 2 |
| Fewer waking episodes (from +1 to +5) | 6 |
| d. What was you waking time? | |
| Earlier (from −5 to −1) | 11 |
| Normal 0 | 3 |
| Later (from +1 to +5) | 14 |
| e. How alert did you feel 30 min after rising? | |
| Less (from −5 to −1) | 26 |
| Normal 0 | 2 |
| More (from +1 to +5) | 0 |
| 3. Fatigue: in general, compared to normal how tired do you feel at the moment? | |
| More (from −5 to −1) | 0 |
| Normal 0 | 0 |
| Less (from +1 to +5) | 28 |
| 4. Meals. Compare with normal: | |
| a. How hungry did you feel before your meal? | |
| Less (from −5 to −1) | 9 |
| Normal 0 | 7 |
| More (from +1 to +5) | 12 |
| b. How palatable (appetising) was the meal? | |
| Less (from −5 to −1) | 9 |
| Normal 0 | 11 |
| More (from +1 to +5) | 8 |
| c. After your meal, how do you now feel? | |
| Still hungry (from −5 to −1) | 7 |
| Satisfied 0 | 9 |
| Bloated (from +1 to +5) | 12 |
| 5. Mental performance and mood. Compared with normal: | |
| a. How well have you been able to concentrate? | |
| Worse (from −5 to −1) | 21 |
| Normal 0 | 5 |
| Better (from +1 to +5) | 2 |
| b. How motivated do you feel? | |
| Less (from −5 to −1) | 11 |
| Normal 0 | 9 |
| More (from +1 to +5) | 8 |
| c. How irritable do you feel? | |
| Less (from −5 to −1) | 6 |
| Normal 0 | 7 |
| More (from +1 to +5) | 15 |
| 6. Bowel activity today. Compared with normal: | |
| a. How frequent have your bowel motions been? | |
| Less (from −5 to −1) | 16 |
| Normal 0 | 8 |
| More (from +1 to +5) | 4 |
| b. How has the consistency been? | |
| Harder (from −5 to −1) | 17 |
| Normal 0 | 7 |
| Looser (from +1 to +5) | 4 |
The subjects have filled in the questionnaire based on a score. For the item n.1 the score is from 0 to 10; for the other items, the score is from −5 to +5. The subjects have been classified in three groups according to the response for each item (in the round brackets the range of the score associated to each group has been reported)