. 2007 Nov;211(5):579–588. doi: 10.1111/j.1469-7580.2007.00811.x

Table 4.

Homothety ratios and relationship to trachea

Generation	WA	LA	WT	LD
1	0.76	0.57	0.98	0.75
2	0.75	0.56	0.99	0.75
3	0.69	0.45	0.98	0.65
4	0.69	0.55	0.91	0.73
5	0.67	0.53	0.89	0.72
6	0.75	0.64	0.91	0.79
7	0.86	0.80	0.95	0.90
8	0.97	0.94	0.99	0.97
9	0.94	0.92	0.98	0.97
10	1.00	0.99	1.00	1.00
11	0.94	0.91	0.98	0.97
12	0.83	0.82	0.91	0.90
13	0.81	0.86	0.87	0.94
14	1.12	0.86	1.15	0.94

	WA	LA	WT	LD

Mean HR	0.84	0.74	0.96	0.86
Relationship to trachea	WA_Z = WA₀1.68^−z/3 = WA₀0.84^z	LA_Z = LA₀2.45^−z/3 = LA₀0.74^z	WT_Z = WT₀1.12^−z/3 = WT₀0.96^z	LD_Z = LD₀1.60^−z/3 = LD₀0.86^z

Data are homothety ratios averaged over subjects per generation, mean homothety ratios averaged over subjects and generations (mean HR) and formulation of the relationship to trachea. Wall area (WA), lumen area (LA), wall thickness (WT), lumen diameter (LD) and bronchial generation order (z) considering trachea as generation 0.