Table 1.

Number and size of glass particles by ampoule size and breaking method (n = 672)

		Number of glass particles
Breaking method	Ampoule size (ml)	<20G <60 µm	19G 61–68 µm	18G 69–83 µm	84–120 µm	>120 µm	Total	Mean (SD)
Method 1	10	246	5	2	13	22	288	5.14 (4.97)
	2	142	1	3	7	11	164	2.93 (4.24)
		388	6	5	20	33	452	4.04 (4.73)
Method 2	10	401	6	8	21	46	482	8.61 (6.37)
	2	173	0	3	2	11	189	3.38 (4.06)
		574	6	11	23	57	671	5.99 (5.93)
Method 3	10	189	1	1	6	14	211	3.77 (4.06)
	2	47	0	0	2	9	59	1.05 (2.08)
		236	1	2	8	23	270	2.41 (3.99)
Method 4	10	219	0	6	18	19	262	4.68 (5.76)
	2	64	0	2	7	1	74	1.32 (1.97)
		283	0	8	25	20	336	3.00 (4.61)
Method 5	10	235	2	5	12	28	282	5.04 (4.26)
	2	141	2	2	6	6	157	2.80 (5.68)
		376	4	7	18	34	439	3.92 (5.12)
Method 6	10	343	0	4	12	23	382	6.82 (6.86)
	2	175	0	0	3	15	194	3.46 (6.27)
		518	0	5	15	38	576	5.14 (6.75)
Total	10	1633	14	26	82	152	1907	5.68 (5.04)
	2	742	3	12	27	53	837	2.99 (4.44)