Table 1 Number of responses to the questionnaires.
Years of school. | n: 1,657 | |||||
|---|---|---|---|---|---|---|
IQ | Low score | Medium score | Highest score | n | ||
351 | 682 | 406 | 1,439 | |||
Occupation | Sedentary occupation | Manual occupation | n | |||
840 | 807 | 1,647 | ||||
Parental education | Grade school only | High school | >12 years of education | n | ||
474 | 521 | 461 | 1,456 | |||
LBP | Yes | No | n | |||
Questionnaire 1 | 712 | 999 | 1,711 | |||
Questionnaire 2 | 345 | 639 | 985 | |||
Duration: | 0 days | 1–7 days | 8–30 days | >30 days | n | |
Questionnaire 1 | 948 | 243 | 259 | 158 | 1,608 | |
Questionnaire 2 | 637 | 140 | 119 | 49 | 945 | |
Leg pain | Yes | No | n | |||
Questionnaire 1 | 82 | 1589 | 1,671 | |||
Questionnaire 2 | 66 | 912 | 982 | |||
Exemption | Yes | No | n | |||
65 | 806 | 871 | ||||