Table 1

Descriptive statistics of the populations for survival and trajectory analyses by study periods and length of SA

Permanent workers30-day SA*
Study period
60-day SA†
Study period
90-day SA†
Study period
Variable2008/20092010/20112013/20142008/20092010/20112013/20142008/20092010/20112013/2014
Survival analyses (to plot sustained RTW‡ curves)n=6393n=6011n=5708n=1655n=1530n=1481n=932n=847n=766
Age, years (95% CI)49.6 (49.3 to 49.8)49.8 (49.5 to 50.0)49.8 (49.5 to 50.0)51.7 (51.2 to 52.2)51.7 (51.2 to 52.1)51.1 (50.7 to 51.6)52.6 (52.1 to 53.1)51.8 (51.2 to 52.4)51.3 (50.7 to 52.0)
Women, n (%)4857 (76.0)4614 (76.8)4498 (78.7)1219 (73.7)1140 (74.5)1158 (78.2)695 (74.6)633 (74.7)597 (78.0)
Low job status, n (%)3761 (58.8)3390 (56.4)3059 (53.6)1068 (64.5)921 (60.2)847 (57.2)609 (65.3)538 (63.5)444 (58.0)
Practical nurses, n (%)841 (13.2)879 (14.6)932 (16.3)203 (12.3)220 (14.4)261 (17.6)117 (12.6)120 (14.2)140 (18.3)
Trajectory analyses (to plot work participation and calculate gains in work participation)n=4261n=3886n=3683n=849n=765n=757n=402n=346n=332
Age, years (95% CI)52.3 (52.0 to 52.5)50.5 (50.3 to 50.8)50.7 (50.5 to 51.0)51.0 (50.5 to 51.6)50.9 (50.3 to 51.6)51.5 (50.9 to 52.1)51.8 (51.0 to 52.5)50.2 (49.4 to 51.1)51.0 (50.1 to 51.9)
Women, n (%)3120 (73.2)2855 (73.5)2790 (75.8)594 (70.0)544 (71.1)567 (74.9)286 (71.1)254 (73.4)244 (73.5)
Low job status, n (%)2507 (58.8)2180 (56.1)1955 (53.1)546 (64.3)464 (60.7)439 (58.0)260 (64.7)214 (61.8)197 (59.3)
Practical nurses, n (%)527 (12.4)504 (13.0)518 (14.1)96 (11.3)108 (14.1)120 (15.8)49 (12.2)45 (13.0)56 (16.9)
• *Absence in calendar-days.

• Compensated SA days.

• Sustained RTW defined as a minimum of 28 consecutive days at work after SA.