Table 4.

Frequency of stone recurrence according to the morphological type of the stone

	Males		Females		Total
Morphological type(1)	N	%	N	%	N	%
Calcium oxalates
Ia	1735	35.9***,e	499	29.8d	2234	34.3e
Ib	58	26.1c	25	30.9	83	27.4d
Ic	29	85.3e	13	76.5b	42	82.4e
Id	66	40.0	43	46.2	109	42.3
Ie	44	54.3	26	48.2	70	51.9
Ia + IIa	424	41.7	147	38.6	571	40.8
Ia + IIb	1051	39.5**e	306	32.1b	1359	37.6e
IIb + Ia	1433	44.4**	380	38.7	1813	43.1
IIa	773	44.6**	161	37.6	934	43.2
IIb	400	39.1a	86	25.4	486	38.4
IIa + IVa1	959	48.5 **,b	286	40.8	1245	46.5c
IIb + IVa1	213	39.1	99	40.4	312	39.5
Ia + IIa + IVa1	682	46.4**	326	36.8	1008	42.8
Calcium phosphates
IVa1 (w/o struvite)	110	47.8**, a	125	38.0	235	42.0
IVa2	26	70.3a	53	84.1e	79	79.0e
IVb	221	48.3***	335	35.2a	556	39.4b
IVd	229	73.6e	73	68.9e	302	72.4e
Struvite (magnesium ammonium phosphate hexahydrate)
IVc	29	53.7	17	32.7	46	43.4
Uric acids
IIIa	186	45.7	39	50.7a	225	46.5
IIIb	840	53.2**, e	230	47.2b	1070	51.8e
Cystine
Va	312	90.7	233	84.7e	545	88.1e
Vb	20	100d	7	100b	27	100e

⁽¹⁾Complete description of the stone types is given in Daudon et al [9–10].

^*p < 0.05;

^**p < 0.01;

^***p < 0.00001 vs females

^ap < 0.05;

^bp < 0.01;

^cp < 0.001;

^dp < 0.0001;

^ep < 0.00001 vs mean stone recurrence for a given gender or for total