Brand Average value (mg ammonia/g tobacco) Intra-assay CV (%) Inter-assay CV (%) Belinda 0.83 5.97 7.38 Chesterfield 1.47 3.92 5.63 Gauloises 3.93 7.17 8.55

Table 1: Intra- and inter-assay coefficients of variation (%) as determined with 3 brands of cigarettes at 3 different days with 16 independent determinations.

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