Model1: QTc interval = 393.3 + 0.36 × Age + (−0.48) × Male + 1.26 × CRP + (−1.59) × HAQ + 0.84 × CDAI; Model2: QTc interval = 393.3 + 0.36 × Age + (−0.48) × Male + 0.42 × CRP + (−1.59) × HAQ + 0.84 × SDAI; Model3: QTc interval = 390.4 + 0.30 × Age + (−1.47) × Male + 0.60 × CRP + (−0.80) × HAQ + 4.18 × DAS28-ESR
CRP, C-reactive protein; ESR, erythrocyte sedimentation rate; VAS, visual analog scale; DAS28, 28-joint count Disease Activity Score; CDAI, Clinical Disease Activity Index; SDAI, Simplified Disease Activity Index; HAQ, Health Assessment Questionnaire