Figure 5

Fitted line plot comparison of QCM and chemical spectrofluorescence assessment of whole smoke particulate deposition over a range of smoke dilutions for both 3R4F reference cigarette and a 1 mg commercially available cigarette (R² = 97.4%). Solid black line = Regression, dashed red line = 95 % CI (confidence intervals), dotted green line = 95 % PI (prediction intervals). For both cigarette types the relationship between the two methods was statistically significant (p < 0.05); this was based on a sample size large enough (n = 105) to obtain a precise estimate of the strength of the relationship. The fitted equation for the linear model which describes the relationship is: QCM = − 0.6796 + 0.9744 chemical spectrofluorescence.