Table 3

Comparison among the three countries of AS related absence from paid work, mean income, and costs due to productivity loss, calculated by the friction cost method for patients with a paid job

Netherlands (NL) (n=58) Mean (range)France (F) (n=40) Mean (range)Belgium (B) (n=15) Mean (range)Difference NL−F Mean (95% CI)*Difference NL−B Mean (95% CI)*Difference F−B Mean (95% CI)*
NL, The Netherlands; F, France; B, Belgium.
*95% CI tested by bootstrapping the difference in values between countries.
Days sick leave per working patient per year18.5 (0–130)6.0 (0–77)9.2 (0–60)12.5 (3.2 to 22.6)9.3 (−3.2 to 20.6)−3.2 (−13.4 to 5.4)
Duration of episode of sick leave per sick patient38.3 (1–130)12.7 (1–77)19.7 (1–60)25.6 (7.3 to 38.6)18.6 (−8.7 to 34.2)−7 (−30 to 7.7)
Income per working day (euros/working patient)79 (42–126)85 (49–134)73 (40–126)−6 (−17 to 5)6 (−9 to 21)12 (−4 to 29)
Friction costs (euros/patient/year)1257 (0–7356)428 (0–5979)476 (0–2354)829 (221 to 1444)781 (140 to 1436)−48 (−554 to 449)