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Table 2 Summary of 6-month self-reported and urine verified abstinence and missing data by treatment arms and by type of intervention

From: Analysis of self-report and biochemically verified tobacco abstinence outcomes with missing data: a sensitivity analysis using two-stage imputation

   Self-report abstinence and survey missing at 6 months Urine-verified abstinence and urine missing at 6 months
Treatment group Total
N
Self-report abstinence
n (%)
Self-report failure
n (%)
Survey question missing
n (%)
Urine-verified abstinence
n (%a)
Urine-verified failure
n (%a)
Urine missing
n (%a)
By treatment arm
 Tx1 306 65 (21.2%) 194 (63.4%) 47 (15.4%) 38 (58.5%) 6 (9.2%) 21 (32.3%)
 Tx2 296 59 (19.9%) 170 (57.4%) 67 (22.6%) 34 (57.6%) 6 (10.2%) 19 (32.2%)
 Tx3 309 61 (19.7%) 197 (63.8%) 51 (16.5%) 35 (57.4%) 6 (9.8%) 20 (32.8%)
 Tx4 306 79 (25.8%) 156 (51.0%) 71 (23.2%) 50 (63.3%) 7 (8.9%) 22 (27.8%)
By intervention
 No counseling (Tx1 + Tx3) 615 126 (20.5%) 391 (63.6%) 98 (15.9%) 73 (57.9%) 12 (9.5%) 41 (32.5%)
 Counseling (Tx2 + Tx4) 602 138 (22.9%) 326 (54.2%) 138 (22.9%) 84 (60.9%) 13 (9.4%) 41 (29.7%)
 Single contest (Tx1 + Tx2) 602 124 (20.6%) 364 (60.5%) 114 (18.9%) 72 (58.1%) 12 (9.7%) 40 (32.2%)
 Multiple contests (Tx3 + Tx4) 615 140 (22.8%) 353 (57.4%) 122 (19.8%) 85 (60.7%) 13 (9.3%) 42 (30.0%)
Overall 1217 264 (21.7%) 717 (58.9%) 236 (19.4%) 157 (59.5%)b 25 (9.5%)b 82 (31.1%)
  1. Tx1: single contest + no counseling; Tx2: single contest + counseling; Tx3: multiple contests + no counseling; Tx4: multiple contest + counseling
  2. aPercentage out of those who self-reported abstinence
  3. bFive subjects whose urine samples were not of adequate amount for testing. These 5 missing urine test results were assumed to have the same distribution as the rest 177 urine samples (86% verified abstinence and 14% verified failure) and added to the two columns accordingly