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Table 1 Study population, number and characteristics

From: Comparison of medical costs generated by IBS patients in primary and secondary care in the Netherlands

  Primary care patients Primary care controls Secondary care patients Secondary care controls
Total number N 326 652 9274 18548
Female gender N / % 230 / 70 % 460 / 70 % 6506 / 70 % 13012 / 70 %
Patients with data before diagnosis N 133 266 5972 11944
Patients with data after diagnosis N 326 652 7538 15076
Age Average (SD) 49 (17) 49 (17) 53 (18) 53 (18)