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Table 5 Coefficient estimates of Tobit and Two-part model using main effects with or without interaction terms

From: Mapping function from FACT-B to EQ-5D-5 L using multiple modelling approaches: data from breast cancer patients in China

Variable Tobit4 Tobit5 Two-part 4 Two-part 5
   First-part Second-part First-part Second-part
Constant −0.60177*** − 0.77881*** 0.00048 − 0.81605*** 4.89e-06 −1.02358***
FACT-B total score
 PWB 0.04438*** 0.05329*** 0.62518** 0.05972*** 0.76743 0.06598***
 EWB 0.02293** 0.01407     
 FWB 0.00821 0.01547 0.90802 0.02163*** 0.89512 0.03590***
 BCS 0.02609*** 0.03107*** 1.55562 0.04312*** 1.78533 0.04396***
Dimension squared
 PWB squared −0.00062*** − 0.00007 1.01569*** − 0.00106*** 1.01664*** −0.00033
 EWB squared −0.00057* − 0.00023     
 FWB squared −0.00003 0.00013 1.00524 −0.00048*** 1.00599* −0.00019
 BCS squared −0.00032* 0.00018 0.99500 −0.00069*** 0.99905 −0.00015
Dimension interaction
 PWB × EWB   0.00001     
 PWB × FWB   −0.00013    1.00542 −0.00059*
 PWB × BCS   −0.00114***    0.98847 −0.00105***
 EWB × FWB   −0.00010     
 EWB × BCS   −0.00005     
 FWB × BCS   −0.00032    0.99508 −0.00042
  1. * P<0.10, ** P<0.05, *** P<0.01