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Table 5 Classification and regression tree predicting smoking cessation success rates from baseline and process data

From: A randomized controlled trial of directive and nondirective smoking cessation coaching through an employee quitline

Did not complete all calls

(N = 238)

14 % quit at last contact

Longest quit < 61 d

(124)

4 %

PHQ ≥ 4

(79) 0 %

 

PHQ < 4

(45) 11 %

Key steps < 4 (34) 0 %

Key steps ≥ 4 (11) 45 %

Longest quit ≥ 61 d

(114)

25 %

RSEQ < 2.7

(83) 16 %

Start age ≥ 17 (24) 0 %

Start age < 17 (59) 22 %

RSEQ ≥ 2.7

(31) 48 %

Calls ≥ 33 min (23) 35 %

Calls < 33 min (8) 87 %

Completed all calls

(280)

40 %

PPOS ≥ 3.8

(51)

18 %

RSEQ < 2.1

(13) 0 %

 

RSEQ ≥ 2.1

(38) 24 %

QSU.AV < 1.5 (16) 6 %

QSU.AV ≥ 1.5 (22) 36 %

PPOS < 3.8

(229)

45 %

FTND ≥ 6

(30) 17 %

QSU.AV < 3.8 (25) 8 %

QSU.AV ≥ 3.8 (5) 60 %

FTND < 6

(199) 49 %

RSEQ < 3.3 (185) 46 %

RSEQ ≥ 3.3 (14) 93 %

  1. Among all participants (N = 518), 28 % quit at last contact. Each cell is a subset of the cell to its left, split on the indicated variable and value, and shows the number of persons classified (N), and the percentage who had quit at last contact (%)
  2. BMI Body Mass Index, FTND Fagerström Test for Nicotine Dependence, PHQ 8-items of the Patient Health Questionnaire, PPOS the sharing subscale of the Patient Practitioner Orientation Scale, a measure of interest in shared decision making, QSU.AV Aversive subscale of the Questionnaire of Smoking Urges, RSEQ Relapse Situation Efficacy Questionnaire. Six key steps are described in the Interventions section of the Methods. Start age is the age when the participant first smoked