Table 3

Clinical characteristics

			Temporal sample					Geographic sample
	Original series				95% CI for the %					95% CI for the %
	n	Per cent	n	Per cent	Lower	Upper	p Value	n	Per cent	Lower	Upper	p Value
Final PVR
Yes	138	30.7	18	20	11.74	28.26	*0.0369*	133	29.2	24.99	33.34	0.5098
Pre-existent PVR
Control—RD	312	69.3	72	82.8	74.82	90.70	*0.0092*	323	71.9	67.78	76.09	0.2458
No	90	20.0	10	11.5	4.79	18.20	0.0644	72	16.0	12.64	19.43	*0.0412*
Yes	48	10.7	5	5.7	0.86	10.64	0.1865	54	12.0	9.02	15.04	0.3242
Total	450		87 (3)					449 (7)
Family history of RD
No	405	90.2	77	85.6	78.29	92.82	0.192	439	96.3	94.53	98.01	*<0.0001*
Yes	44	9.8	13	14.4	7.18	21.71	0.192	17	3.7	1.99	5.47	*<0.0001*
Total	449 (1)		90					456
Aphakia/psedophakia
Yes	143	31.8	42	47.7	37.29	58.16	*0.002*	148	33.9	29.43	38.30	0.3807
No	307	68.2	46	52.3	41.84	62.71	*0.002*	289	66.1	61.70	70.57	0.3807
Total	450		88 (2)					437 (19)
RD in fellow eye
Yes	44	9.8	6	7.0	1.59	12.36	0.4844	36	8.1	5.53	10.58	0.2451
No	405	90.2	80	93.0	87.64	98.41	0.4844	411	91.9	89.42	94.47	0.2451
Total	449 (1)		86 (4)					447 (9)
Pneumatic retinopexy
Yes	9	10.0	0	0	0.00	34.45	0.5982	4	5.6	1.8	14.35	0.2888
No	81	90.0	10	100	65.55	100	0.5982	68	94.4	85.65	98.21	0.2888
Total	90		10					72
Scleral surgery
Yes	50	55.6	1	10.0	0.52	45.89	*0.0098*	15	21.1	12.68	32.75	*<0.0001*
No	40	44.4	9	90.0	54.12	99.48	*0.0098*	56	78.9	67.25	87.32	*<0.0001*
Total	90		10					71 (1)
PPV
Yes	53	58.9	9	90.0	54.12	99.48	0.0935	65	90.3	0.80.42	95.67	*<0.0001*
No	37	41.1	1	10.0	0.52	45.89	0.0935	7	9.7	4.33	19.58	*<0.0001*
Total	90		10					72
Laser
Yes	55	62.5	5	50.0	20.14	79.86	0.6242	59	81.9	70.74	89.67	*0.001*
No	33	37.5	5	50.0	20.14	79.86	0.6242	13	18.1	10.33	29.26	*0.001*
Total	88 (2)		10					72
Cryotherapy
Yes	38	44.2	5	50.0	20.14	79.86	0.9594	27	37.5	26.6	49.74	0.3048
No	48	55.8	5	50.0	20.14	79.86	0.9594	45	62.5	50.26	73.4	0.3048
Total	86 (4)		10					72
Tamponade: SF6
Yes	15	30.0	3	33.3	10.22	67.31	∼1	41	63.1	50.15	74.45	*<0.0001*
No	35	70.0	6	66.7	32.69	89.79	∼1	24	36.9	25.55	49.85	*<0.0001*
Total	50 (3)		9					65
Tamponade: C3F8
Yes	14	28.0	2	22.2	3.95	59.81	0.9882	14	21.5	12.68	33.81	0.3067
No	36	72.0	7	77.8	40.19	96.05	0.9882	51	78.5	66.19	87.32	0.3067
Total	50 (3)		9					65
Tamponade: Silicone oil
Yes	10	20.0	2	22.2	5.33	56.81	∼1	53	81.5	69.59	89.7	*<0.0001*
No	40	80.0	7	77.8	43.19	94.67	∼1	12	18.5	10.30	30.42	*<0.0001*
Total	50 (3)		9					65

General characteristics of original and validation series. Tamponades are indicated only when vitrectomy was performed. (n) Missings are indicated for each variable where existing, beside total. In bold, statistical significant values.
n, number of patients; PPV, pars plana vitrectomy; PVR, proliferative vitreoretinopathy; RD, retinal detachment.