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

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

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

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.

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