Properties of self reported measures of exposure to cigarette smoke, in 386 daily and occasional smokers (Geneva, Switzerland, 1999)
| Test-retest1-151 | Missing data (%) | Mean | SD | |
| Cigarettes per day | 0.941-165 | 5.7 | 17.9 | 12.4 |
| Cig/day, with values >25 set to 25 | 0.861-165 | 5.7 | 15.6 | 7.8 |
| Number of butts | — | 72.3 | 14.5 | 9.0 |
| Puffs per cigarette | 0.541-165 | 24.4 | 11.4 | 5.6 |
| Intensity of smoking (0–100 rating) | 0.771-165 | 16.1 | 56.8 | 26.8 |
| Self reported nicotine yield (mg) | 0.851-165 | 11.9 | 0.55 | 0.28 |
| Nicotine yield observed on pack (mg) | — | 53.1 | 0.56 | 0.27 |
| Self reported tar yield (mg) | 0.901-165 | 11.9 | 6.37 | 3.67 |
| Tar yield observed on pack (mg) | — | 53.1 | 6.65 | 3.73 |
| Type of cigarettes (regular + mild + hand rolled versus light + ultralight) | 0.901-165 | 6.2 | — | — |
| Self reported length of butts (mm) | 0.631-165 | 10.9 | 35.5 | 7.3 |
| Actual length of butts (mm) | — | 72.3 | 35.3 | 6.3 |
| Colour of the end of the filter (0–10 scale) | 0.681-165 | 11.1 | 5.6 | 2.1 |
| Depth of inhalation (1–5 scale) | 0.811-165 | 5.4 | 3.6 | 0.8 |
| Total quantity of smoke inhaled (0–10 scale) | 0.801-165 | 12.7 | 5.4 | 2.2 |
| Fagerström test for nicotine dependence | 0.811-165 | 4.9 | 3.2 | 2.5 |
| FTND items: | ||||
| 1 Minutes to first cig (in four categories) | 0.931-165 | 10.4 | 1.3 | 1.0 |
| 1 Minutes to first cig (continuous) | 0.961-165 | 10.4 | 90.3 | 125.1 |
| 2 Difficult to refrain | 0.651-165 | 5.4 | 0.2 | 0.4 |
| 3 Cig hate most to give up | 0.27** | 8.3 | 0.4 | 0.5 |
| 4 Cig per day (in four categories) | 0.851-165 | 5.7 | 1.0 | 0.9 |
| 5 Morning smoking | 0.751-165 | 6.0 | 0.2 | 0.4 |
| 6 Smoke if ill | 0.581-165 | 6.2 | 0.2 | 0.4 |
| Predicted value from four item model (see table 3) | 0.851-165 | 18.7 | 246.1 | 131.2 |