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Table 4 Mean differences (95% confidence intervals) and p values of group comparisons*

From: Cost-effectiveness of tailored print communication, telephone motivational interviewing, and a combination of the two: results of an economic evaluation alongside the Vitalum randomized controlled trial

Costs

TPC vs. combined

TPC vs. TMI

TPC vs. control

combined vs. TMI

combined vs. control

TMI vs. control

Variable

-24 (-26 to -23)

p < 0.001

-52 (-54 to -49)

p < 0.001

40 (40 to 41)

p < 0.001

-27 (-29 to -24)

p < 0.001

65 (63 to 66)

p < 0.001

92 (89 to 94)

p < 0.001

Fixed

2

2

17

-0.1

15

15

Total

-23 (-24 to -21)

p < 0.001

-50 (-50 to -47)

p < 0.001

57 (57 to 58)

p < 0.001

-27 (-30 to -25)

p < 0.001

80 (79 to 81)

p < 0.001

107 (105 to 109)

p < 0.001

  1. Notes TPC = tailored print communication; TMI = telephone motivational interviewing; combined = combination of TPC and TMI; *Confidence intervals and p values were obtained by bias corrected accelerated bootstrapping with 2000 replications in Stata.