Table 1. Patients’ characteristics.

Volunteer	Age (years)	Menstrual cycle	Deliveries	Caesarean delivery	Placenta at second pregnancy
1	30	Luteal phase	–	–	–
2	28	Luteal phase	–	–	–
3	29	Luteal phase	–	–	–
4	29	Menses	–	–	–
5	27	Luteal phase	–	–	–
6	29	Luteal phase	–	–	–
7	28	Luteal phase	–	–	–
8	29	Luteal phase	–	–	–
9	30	Luteal phase	P2 D2	2	Normal
10	34	Luteal phase	P2 D2	2	Previa accrete
11	29	Luteal phase	P2 D2	2	Previa
12	55	Luteal phase	P2 D2	–
13	73	Luteal phase	P1 D1	1	Normal
14	29	Luteal phase	–	–	–
15	26	Menses	–	–	–
16	36	Luteal phase	P1 D1	1	Normal
17	47	Luteal phase	P1 D1	1	Normal
18	35	Luteal phase	P2 D2	–	Normal
19	30	Follicular phase	P1 D1	–	Normal
20	31	Luteal phase	P1 D1	–	Normal
21	32	Follicular phase	P1 D1	–	Normal
22	32	Follicular phase	–	–	–
23	25	Luteal phase	–	–	–
24	27	Luteal phase	–	–	–
25	44	Menses	–	–	–
26	47	Menses	P1 D1	1	Normal
27	55	Menopause	P1 D1	1	Normal
28	59	Menopause	P1 D1	–	–
29	42	Menopause	P1 D1	1	–
30	41	Menopause	P1 D1	–	–

P, pregnancy; D, deliveries.

Volunteers number 10 and 11 written in italics are the ones with placental complication at second delivery.