Table 4.

Treatment outcomes of registered cycles according to patients' age, Japan, 2016

Age (y)	No. of registered cycles	No. of ET cycles	Pregnancy	Live birth	Miscarriage	Pregnancy rate per ET (%)	Pregnancy rate per registered cycles (%)	Live birth rate per registered cycles (%)	Miscarriage rate per pregnancy (%)	Multiple pregnancy rate (%)[Link]
Under 20s	39	3	1	1	0	33.3	2.6	2.6	0.0	0.0
21	29	13	6	4	2	46.2	20.7	13.8	33.3	0.0
22	71	37	11	9	2	29.7	15.5	12.7	18.2	0.0
23	160	86	37	32	4	43.0	23.1	20.0	10.8	0.0
24	364	211	98	77	15	46.4	26.9	21.2	15.3	7.3
25	748	440	189	143	37	43.0	25.3	19.1	19.6	3.8
26	1463	903	386	294	73	42.7	26.4	20.1	18.9	3.4
27	2581	1631	737	568	130	45.2	28.6	22.0	17.6	3.4
28	4658	2898	1310	1035	216	45.2	28.1	22.2	16.5	2.7
29	7139	4527	1939	1520	327	42.8	27.2	21.3	16.9	3.0
30	10 020	6349	2729	2134	475	43.0	27.2	21.3	17.4	3.0
31	12 951	8156	3434	2667	613	42.1	26.5	20.6	17.9	2.9
32	15 832	10 066	4184	3249	755	41.6	26.4	20.5	18.0	3.2
33	18 966	12 138	4909	3784	900	40.4	25.9	20.0	18.3	3.1
34	22 690	14 345	5649	4302	1120	39.4	24.9	19.0	19.8	2.7
35	25 444	16 180	6284	4727	1288	38.8	24.7	18.6	20.5	3.8
36	28 303	17 667	6412	4661	1467	36.3	22.7	16.5	22.9	3.4
37	31 195	19 264	6926	4899	1716	36.0	22.2	15.7	24.8	3.6
38	34 733	20 929	6759	4676	1782	32.3	19.5	13.5	26.4	3.3
39	38 677	22 607	6703	4454	1953	29.7	17.3	11.5	29.1	3.5
40	39 752	22 168	5773	3567	1978	26.0	14.5	9.0	34.3	3.8
41	39 219	20 971	4771	2691	1895	22.8	12.2	6.9	39.7	3.2
42	38 048	19 208	3397	1717	1532	17.7	8.9	4.5	45.1	2.5
43	29 011	13 771	1918	820	1009	13.9	6.6	2.8	52.6	2.7
44	20 313	8823	930	330	565	10.5	4.6	1.6	60.8	2.4
45	12 560	4961	319	92	208	6.4	2.5	0.7	65.2	2.0
46	6437	2389	112	36	73	4.7	1.7	0.6	65.2	0.0
47	3418	1146	33	10	22	2.9	1.0	0.3	66.7	0.0
48	1716	547	9	1	8	1.6	0.5	0.1	88.9	0.0
49	772	243	6	1	4	2.5	0.8	0.1	66.7	0.0
Over 50s	481	158	5	3	2	3.2	1.0	0.6	40.0	0.0

ET, embryo transfer.

Multiple pregnancies were defined according to the number of gestational sacs in utero.