Appendix Table 4.

Statistical tests of changes in presenteeism and absenteeism at pairs of time points, stratified by joint

Total Hip Arthroplasty
Presenteeism	Before Surgery to 6 Months After					Before Surgery to 1 Year After
	N	Mean Before	Mean After	Mean Δ	Rank P-value	N	Mean Before	Mean After	Mean Δ	Rank P-value
Absolute Presenteeism, All Patients	224	80.9	90.0	9.0	<0.0001	231	79.9	89.4	9.5	<0.0001
Full Performance (Absolute Presenteeism = 100%)	224	21.0%	42.0%	21.0%	<0.0001*	231	21.6%	35.5%	0.1	0.001*
Absolute Presenteeism, Before Surgery < 100%	177	75.9	88.0	12.1	<0.0001	181	74.4	88.8	14.4	<0.0001
Absolute Presenteeism, Before Surgery = 100%	47	100.0	97.2	−2.8	0.0003	50	100.0	91.6	−8.4	<0.0001
Absenteeism (28-Day Recall) In the past 4 weeks (28 days), how many days did you...	Before Surgery to 6 Months After					Before Surgery to 1 Year After
	N	Mean Before	Mean After	Mean Δ	Rank P-value	N	Mean Before	Mean After	Mean Δ	Rank P-value
... miss work because of problems with your physical or mental health?	214	0.89	0.61	−0.27	<0.0001	220	1.16	0.77	−0.39	<0.0001
... miss work because of problems with a family member’s physical or mental health?	214	0.37	0.33	−0.04	0.2642	220	0.33	0.26	−0.07	0.1457
... miss work for any other reason (including vacation)?	214	2.05	1.91	−0.14	0.2581	220	1.86	2.53	0.67	0.0785
... come in early, go home late, work extra from home, or work on your day off?	212	6.22	5.84	−0.38	0.7105	219	6.26	5.41	−0.85	0.5795
Absenteeism (7-Day Recall)	Before Surgery to 6 Months After					Before Surgery to 1 Year After
	N	Mean Before	Mean After	Mean Δ	Rank P-value	N	Mean Before	Mean After	Mean Δ	Rank P-value
How many days are you expected to work in a typical 7-day week?	219	4.87	4.82	−0.05	0.4267	228	4.92	4.85	−0.07	0.3547
How many hours does your employer expect you to work in a typical 7-day week?	218	36.59	36.86	0.27	0.3513	227	36.73	36.87	0.14	0.2252
About how many hours altogether did you work in the past 7 days?	219	36.61	37.12	0.51	0.254	228	36.50	37.35	0.85	0.1503
7-Day Absenteeism Score (hours per month)	218	−0.39	−1.38	−0.99	0.4381	227	0.63	−2.21	−2.84	0.4507
Total Knee Arthroplasty
Presenteeism	Before Surgery to 6 Months After					Before Surgery to 1 Year After
	N	Mean Before	Mean After	Mean Δ	Rank P-value	N	Mean Before	Mean After	Mean Δ	Rank P-value
Absolute Presenteeism, All Patients	209	82.9	88.0	5.2	<0.0001	209	81.6	89.3	7.7	<0.0001
Full Performance (Absolute Presenteeism = 100%)	209	21.5%	32.1%	10.6%	0.0151*	209	20.1%	38.3%	0.2	<0.0001*
Absolute Presenteeism, Before Surgery < 100%	164	78.2	87.0	8.8	<0.0001	167	77.0	87.4	10.4	<0.0001
Absolute Presenteeism, Before Surgery = 100%	45	100.0	91.8	−8.2	<0.0001	42	100.0	97.1	−2.9	0.0016
Absenteeism (28-Day Recall) In the past 4 weeks (28 days), how many days did you...	Before Surgery to 6 Months After					Before Surgery to 1 Year After
	N	Mean Before	Mean After	Mean Δ	Rank P-value	N	Mean Before	Mean After	Mean Δ	Rank P-value
... miss work because of problems with your physical or mental health?	187	0.83	0.21	−0.62	<0.0001	189	1.14	0.57	−0.57	<0.0001
... miss work because of problems with a family member’s physical or mental health?	187	0.18	0.18	0.00	0.4488	189	0.15	0.25	0.10	0.6449
... miss work for any other reason (including vacation)?	187	2.10	1.29	−0.81	0.0054	189	2.34	2.26	−0.08	0.572
... come in early, go home late, work extra from home, or work on your day off?	187	5.71	4.93	−0.78	0.1538	189	6.04	4.95	−1.09	0.0488
Absenteeism (7-Day Recall)	Before Surgery to 6 Months After					Before Surgery to 1 Year After
	N	Mean Before	Mean After	Mean Δ	Rank P-value	N	Mean Before	Mean After	Mean Δ	Rank P-value
How many days are you expected to work in a typical 7-day week?	199	4.78	4.69	−0.09	0.7576	200	4.74	4.65	−0.09	0.0907
How many hours does your employer expect you to work in a typical 7-day week?	198	35.66	35.54	−0.12	0.5423	198	34.80	34.81	0.01	0.9361
About how many hours altogether did you work in the past 7 days?	199	36.09	37.60	1.51	0.3197	199	35.20	36.05	0.85	0.5584
7-Day Absenteeism Score (hours per month)	198	−2.45	−8.19	−5.74	0.4684	196	−3.10	−4.84	−1.74	0.6664

Note: P-values are from Wilcoxon signed-rank tests, except those with an astericks, which are from two-sample test of proportions.