Table 4.

Costs of productivity loss per week (CAD)^b, comparing the main model with alternative model adding control status as confounder

SCQ score	Main Model	Alternative modela
0	205.12 ± 42.09	215.05 ± 50.51
1	244.42 ± 45.46	253.10 ± 53.85
2	290.07 ± 51.73	296.62 ± 59.65
3	342.81 ± 62.54	346.31 ± 69.40
4	403.47 ± 79.29	402.74 ± 84.45
5	472.90 ± 103.02	466.56 ± 105.91
6	552.02 ± 134.70	538.45 ± 134.69
7	641.82 ± 175.39	619.12 ± 171.69
8	743.35 ± 226.39	709.36 ± 217.94
9	857.74 ± 289.24	809.96 ± 274.69
10	986.20 ± 365.75	921.82 ± 343.39
11	1130.04 ± 458.03	1045.86 ± 425.72
12	1290.72 ± 568.50	1183.12 ± 523.60
13	1469.79 ± 699.91	1334.70 ± 639.22
14	1669.0 ± 855.37	1501.83 ± 775.04*
15	1890.27 ± 1038.37*	1685.85 ± 933.81*

*P value is not significant

^aAlternative model: two part model regression analysis on the main model after adding control status

^b2010 Canadian dollars