Table 2 The results of Tobit regression and Generalized linear models analyses on utility index and VAS score
|  | Model 1 (β (95% CI)) | Model 2 (β (95% CI)) | Model 3 (β (95% CI)) | |||
|---|---|---|---|---|---|---|
Utility index | VAS score | Utility index | VAS score | Utility index | VAS score | |
PHQ-2 score | ||||||
 0 | Reference | Reference | Reference | Reference | Reference | Reference |
 1 | −0.051 (− 0.064, − 0.037) | − 2.54 (− 3.21, − 1.86) | − 0.063 (− 0.076, − 0.050) | − 3.43 (− 4.08, − 2.77) | − 0.061 (− 0.073, − 0.048) | − 3.29 (− 3.93, − 2.64) |
 2 | −0.089 (− 0.104, − 0.073) | − 5.66 (− 6.45, − 4.86) | − 0.094 (− 0.108, − 0.080) | −6.20 (− 6.97, − 5.43) | − 0.090 (− 0.104, − 0.076) | −5.94 (− 6.69, − 5.18) |
 3 | −0.177 (− 0.201, − 0.152) | −7.71 (− 9.06, − 6.36) | − 0.165 (− 0.188, − 0.142) | − 7.32 (− 8.63, − 6.01) | − 0.158 (− 0.181, − 0.136) | −6.77 (− 8.05, − 5.48) |
 4 | − 0.168 (− 0.198, − 0.138) | −9.11 (− 10.78, − 7.45) | −0.147 (− 0.176, − 0.119) | −8.72 (− 10.33, − 7.10) | −0.141 (− 0.169, − 0.113) | − 8.35 (− 9.94, −-6.75) |
 5 | −0.248 (− 0.298, − 0.197) | −13.24 (− 16.15, − 10.34) | −0.232 (− 0.279, − 0.185) | − 12.31 (− 15.11, − 9.51) | − 0.220 (− 0.266, − 0.174) | −11.49 (− 14.24, − 8.74) |
 6 | −0.244 (− 0.279, − 0.210) | −13.30 (− 15.28, − 11.32) | − 0.211 (− 0.244, − 0.179) | −11.60 (− 13.51, − 9.69) | − 0.201 (− 0.233, − 0.169) | −10.88 (− 12.76, − 8.99) |
 P trend | < 0.001 | < 0.001 | < 0.001 | < 0.001 | < 0.001 | < 0.001 |
Depressive symptoms | ||||||
 Yes | −0.194 (− 0.212, − 0.176) | − 9.03 (− 10.01, − 8.04) | − 0.174 (− 0.191, − 0.167) | − 8.22 (− 9.18, − 7.26) | − 0.166 (− 0.182, − 0.149) | −7.65 (− 8.60, − 6.70) |
 No | Reference | Reference | Reference | Reference | Reference | Reference |
GAD-2 score | ||||||
 0 | Reference | Reference | Reference | Reference | Reference | Reference |
 1 | −0.048 (− 0.063, − 0.034) | −0.90 (− 1.63, − 0.17) | −0.062 (− 0.076, − 0.049) | −1.69 (− 2.40, − 0.98) | −0.061 (− 0.074, − 0.048) | − 1.55 (− 2.25, − 0.85) |
 2 | −0.095 (− 0.111, − 0.078) | − 3.53 (− 4.39, − 2.66) | − 0.102 (− 0.117, − 0.087) | − 4.10 (− 4.93, − 3.26) | − 0.100 (− 0.115, − 0.085) | − 3.95 (− 4.78, − 3.13) |
 3 | − 0.103 (− 0.130, − 0.076) | −3.99 (− 5.47, − 2.50) | − 0.104 (− 0.130, − 0.080) | −4.19 (− 5.62, − 2.76) | − 0.100 (− 0.125, − 0.075) | −3.88 (− 5.29, − 2.47) |
 4 | −0.116 (− 0.146, − 0.086) | −4.43 (− 6.11, − 2.75) | − 0.122 (− 0.150, − 0.093) | − 4.75 (− 6.38, − 3.13) | −0.124 (− 0.151, − 0.096) | −4.92 (− 6.52, − 3.33) |
 5 | −0.144 (− 0.196, − 0.093) | −4.57 (− 7.52, − 1.64) | − 0.135 (− 0.184, − 0.086) | −4.37 (− 7.21, − 1.52) | − 0.131 (− 0.179, − 0.083) | − 4.03 (− 6.83, − 1.23) |
 6 | − 0.202 (− 0.237, − 0.168) | −6.90 (− 8.88, − 4.92) | − 0.195 (− 0.227, − 0.162) | −7.07 (− 8.99, − 5.16) | −0.191 (− 0.223, − 0.160) | −6.62 (− 8.50, − 4.73) |
 P trend | < 0.001 | < 0.001 | < 0.001 | < 0.001 | < 0.001 | < 0.001 |
Anxiety symptoms | ||||||
 Yes | −0.139 (− 0.158, − 0.121) | −6.03 (− 7.06, − 4.99) | − 0.135 (− 0.153, − 0.117) | − 6.05 (− 7.05, − 5.05) | − 0.132 (− 0.149, − 0.114) | −5.79 (− 6.78, − 4.80) |
 No | Reference | Reference | Reference | Reference | Reference | Reference |