Scand J Work Environ Health 33:233–239PubMed Cox DR, Snell EJ (1968) A general definition of residuals. J R Stat Soc Ser B Methodol 30:248–275 Crook J, Moldofsky H (1994) The probability of recovery and return to work
from work disability as a function of time. Qual Life Res 3(suppl 1):97–109. doi:10.1007/BF00433383 CrossRef Gjesdal S, Bratberg E (2002) The role of gender in long-term sickness absence and transition to permanent disability benefits. Eur J Public Health 12:180–186. doi:10.1093/eurpub/12.3.180 PubMedCrossRef BVD-523 Henderson M, Glozier N, Elliot KH (2005) Long term sickness absence. BMJ 330:802–803. doi:10.1136/bmj.330.7495.802 PubMedCrossRef Hensing G (2004) Chapter
4. Methodological aspects in sickness-absence research. Scand J Public Health 32:44–48. doi:10.1080/14034950410021844 CrossRef Hesselius P (2007) Does sickness absence increase the risk of unemployment? J Socio-Econ 36:288–310. doi:10.1016/j.socec.2005.11.037 CrossRef Joling C, Groot W, Janssen PPM (2006) Duration dependence in sickness absence: how can we optimize disability management intervention strategies? J Occup Environ Med 48:803–814. doi:10.1097/01.jom.0000222583.70927.3e PubMedCrossRef Kaplan EL, Meier P (1958) Nonparametric estimation from incomplete observations. J Am Stat Assoc 53:457–481. doi:10.2307/2281868 CrossRef Kivimäki M, Head J, Ferrie JE, Shipley MJ, Vahtera J, Marmot MG (2003) Sickness absence as a global measure of health: evidence from mortality in the Whitehall II prospective cohort study. BMJ 327:364–368. doi:10.1136/bmj.327.7411.364 ABT-888 supplier PubMedCrossRef Koopmans PC, Roelen CAM, Groothoff
JW (2008) Frequent and long-term absence as a risk factor for work disability and job termination among employees in the private sector. Occup Environ Med 65:494–499PubMedCrossRef Krause N, Frank JW, Dasinger LK, Sullivan TJ, Sinclair SJ (2001) Determinants of duration of disability and return-to-work after work-related injury and illness: challenges for future research. Am J Ind Med 40:464–484. doi:10.1002/ajim.1116 PubMedCrossRef Lie SA, Eriksen HR, Ursin H, Hagen EM (2008) A multi-state model for sick-leave PFKL data applied to a randomized control trial study of low back pain. Scand J Public Health 36:279–283. doi:10.1177/1403494807086979 PubMedCrossRef Lund T, Labriola M, Christensen KB, Bültmann U, Villadsen E (2006) Return to work among sickness-absent Danish employees: prospective results from the Danish Work Environment Cohort Study/National Register on Social Transfer Payments. Int J Rehabil Res 29:229–235. doi:10.1097/01.mrr.0000210056.24915.c2 PubMedCrossRef Meira-Machado LF, Una-Alvarez JD, Cadarso-Suarez C, Andersen P (2008) Multi-state models for the analysis of time-to-event data. Stat Methods Med Res. doi:10.