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Table 1 Number of responses to the questionnaires.

From: Low back pain in military recruits in relation to social background and previous low back pain. A cross-sectional and prospective observational survey

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