an increasing trendp = .006
The control group showed a more complex pattern of RTW: A linear contrast [χ 2 (1) = 6.87, p = .009] corresponded to an increasing trend of RTW, but a quadratic contrast [χ 2 (1) = 7.48, p = .006] showed that RTW was not that stable, that is, first an increase and then a decrease of RTW.