Variables | 1996 N=2197 | 2011 N=3558 | Standardisation* | p Value |
---|---|---|---|---|
Number of changes of driver since de beginning of the trip | NS | |||
Mean±SD | 0.19±0.60 | 0.23±0.61 | 0.27 | |
Stops since the beginning of the trip | <0.0001 | |||
Mean±SD | 2.70±1.64 | 2.16±1.26 | 2.31 | |
Total duration of stops | <0.0001 | |||
Mean±SD | 174±384 | 61±144 | 78.5 | |
Sleep during stops | % | <0.0001 | ||
No | 1744 (86.9) | 3358 (94.4) | 93.2 | |
Yes | 263 (13.1) | 200 (5.6) | 6.8 | |
Sleeping as a passenger | % | NS | ||
No | 1898 (94.6) | 3384 (95.1) | 93.8 | |
Yes | 108 (5.4) | 174 (4.9) | 6.2 | |
Number of cans of caffeinated drink/cups of coffee or tea per day | <0.0001 | |||
Mean±SD | 2.8 (2.4) | 3.5 (2.8) | 3.6 | |
Do you use sleeping pills at least once a week? | NS | |||
Yes | 92 (4.6) | 164 (4.6) | 3.5 | |
No | 1915 (95.4) | 3394 (95.4) | 96.5 | |
Do you use awakening medications at least once a week? | <0.01 | |||
Yes | 27 (1.4) | 13 (0.4) | 0.4 | |
No | 1980 (98.6) | 3545 (99.6) | 99.6 | |
Did you use awakening medications during this trip? | <0.01 | |||
Yes | 20 (1.0) | 10 (0.3) | 0.2 | |
No | 1987 (99.0) | 3548 (99.7) | 99.8 | |
Do you smoke | <0.0001 | |||
Yes | 674 (33.6) | 781 (22.0) | 22.0 | |
Non | 1333 (66.4) | 2777 (78.0) | 78.0 |
*Standardisation: The standardisation column represents the rate and average that will be found if the 2011 drivers had the same distribution than the 1996 population according to age, sex and driving distance.