Table 3. Average total net surface area covered with holes by net type and year among nets with holes.

				Area Using WHOPES PHI Categories (cm2)			Part A: Area Using Circle (cm2)				Part B: Area Using Ellipse (cm2)
Net Type	Year	# Nets	# Intact nets	Median	Geometric Mean	95% CI	Median	Geometric Mean	95% CI	p-value*	Median	Geometric Mean	95% CI	p-value*
Polyethylene	2009	50	1	442	394	(264–588)	261	306	(191–501)	0.02	96	112	(75–167)	<0.0001
	2010	56	1	1546	1167	(763–1786)	1723	1179	(707–1966)	0.94	442	368	(238–569)	<0.0001
	2011	47	0	3078	2614	(1873–3649)	4112	3857	(2275–6538)	0.0007	1376	1089	(677–1749)	<0.0001
	Total	153	2	1429	1049	(810–1358)	1256	1096	(784–1532)	0.32	380	348	(260–466)	<0.0001
Polyester	2009	73	24	65	53	(33–86)	41	34	(20–58)	<0.0001	22	20	(13–32)	<0.0001
	2010	97	7	273	209	(146–299)	159	144	(97–215)	<0.0001	82	45	(52–106)	<0.0001
	2011	86	0	585	504	(377–673)	390	398	(274–577)	0.06	185	172	(122–241)	<0.0001
	Total	256	31	261	190	(149–243)	138	134	(102–177)	<0.0001	80	68	(53–87)	<0.0001

Calculated using WHOPES categories (small = 1.23, medium = 28.3, large = 240.5, extra-large = 706.9), Part A) area assuming circular shaped holes, and Part B) area assuming elliptical shaped holes.

* p-value = Wilcoxon signed rank test comparing total hole area based on WHOPES PHI categories to areas based on formulas of a circle and ellipse (by net type and year). 95% CI = 95% confidence intervals for the mean. Polyester nets: 100 denier, traverse [3.5.50], Polyethylene nets: 150 denier, tulle [3.5.52].