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Table 4 Estimated increase in questionnaire score level (95%confidence interval) by treatment group, by unit increase in baseline score and point of measurement using a linear mixed model

From: Total laparoscopic hysterectomy versus total abdominal hysterectomy with bilateral salpingo-oophorectomy for endometrial carcinoma: a randomised controlled trial with 5-year follow-up

  RAND-36 QoR-40 RI-10
Treatment groupa
 LH 142 (46; 236) 9 (−3; 21) 7 (0; 14)
 AH 0 (reference) 0 (reference) 0 (reference)
Baseline effect
 per 10 unitsb 7 (4; 11) 5 (1; 9) n.a.
Time after surgery
 1 day n.a. 0 (reference) n.a.
 2 days n.a. 4 (−3; 12) n.a.
 3 days n.a. 4 (−4; 11) n.a.
 1 week 0 (reference) 13 (6; 20) 0 (reference)
 2 weeks −8 (−64; 47) 26 (18; 33) 0 (−3; 2)
 4 weeks 49 (−6; 105) n.a. 4 (1; 6)
 6 weeks 130 (74; 185) n.a. 6 (4; 9)
 12 weeks 122 (67; 178) n.a. 8 (5; 11)
  1. Example: On average, the estimated level of the total RAND-36 score in the LH group was 142 units higher as compared with the AH group, at each timepoint from 2 to 12 weeks after surgery. The estimated increase per 10 units higher level in the total RAND-36 score at baseline between two patients was 7 units. This was independent of both timepoint and treatment group. Furthermore, the estimated increase in the total RAND-36 score at 12 weeks after surgery, compared to 1 week after surgery, was 122 units in both groups
  2. Because the data fit very well to the parallel-line model the differences over time after surgery is estimated to be identical in both groups (see also Fig. 2a, b and c)
  3. LH laparoscopic hysterectomy, AH abdominal hysterectomy, RAND-36 RAND 36-Item Short Form Health Survey, QoR-40 Quality of Recovery-40, RI-10 Recovery Index-10, n.a. not applicable
  4. aDifference between groups after correction for baseline differences
  5. bThe baseline effect is the increase in postoperative score per 10 units increase at baseline