Table 1

Average Chinese TNCO and cigarette design characteristics by year

	Year	N	Mean	SD	Minimum	Maximum
Tar	2009	99	11.87	2.09	5.00	15.00
Tar	2012	98	10.93	2.09	5.00	15.00
Nicotine	2009	99	1.05	0.21	0.00	1.40
Nicotine	2012	98	1.01	0.19	0.40	1.30
CO	2009	96	12.70	1.94	6.00	15.00
CO	2012	93	11.98	2.00	6.00	15.00
Cigarette length (mm)	2009	99	83.80	2.07	73.49	93.84
Cigarette length (mm)	2012	98	83.94	2.44	73.79	96.85
Per cigarette weight (g)	2009	99	0.66	0.07	0.45	0.98
Per cigarette weight (g)	2012	98	0.65	0.05	0.49	0.76
Tobacco rod length (mm)	2009	99	59.48	3.64	49.68	68.59
Tobacco rod length (mm)	2012	98	59.57	3.17	53.76	68.48
Filter length (mm)	2009	91	23.69	3.55	15.70	29.84
Filter length (mm)	2012	85	24.12	3.06	18.67	29.96
Tipping paper (mm)	2009	99	30.58	2.78	23.95	36.49
Tipping paper (mm)	2012	98	30.90	2.86	23.84	36.76
Cigarette pressure drop	2009	94	110.94	12.76	72.50	146.30
Cigarette pressure drop	2012	93	109.08	13.34	59.80	144.90
Ventilation (%)	2009	94	8.28	10.43	0.00	48.00
Ventilation (%)	2012	93	10.91	11.35	0.00	46.90
Cigarette paper vacuum porosity	2009	93	54.97	10.17	28.47	81.49
Cigarette paper vacuum porosity	2012	93	54.96	9.17	33.58	78.32
Tobacco moisture (%)	2009	99	15.55	2.42	10.59	18.08
Tobacco moisture (%)	2012	97	15.97	1.46	12.04	18.81
Rod density	2009	99	252.75	23.62	157.67	343.26
Rod density	2012	98	253.40	20.09	192.47	316.10
Filter density	2009	91	121.09	23.45	42.80	343.26
Filter density	2012	84	119.11	10.93	97.01	198.13
Overwrap (mm)	2009	91	6.81	2.22	2.55	13.34
Overwrap (mm)	2012	85	6.57	1.86	3.61	11.42

N=99 for 2009 and N=98 for 2012. Deviations due to unlabelled TNCO values, multipart filters that do not conform with measurement protocols, products over or undersized for measurement equipment and equipment failures.
TNCO, tar, nicotine and carbon monoxide.