Table 4. Clinical pregnancy and live birth rate per retrieval according to hCG dose and age.

hCG (IU)	10,000	5,000	4,000	3,300	p value
Age < 35 y
# of patients	1,333	802	516	280
Clinical Pregnancy (%)	43	49	48.4	44	NS
Live Birth (%)	39.2	45.3	46.7	43.8	NS
Age 35–37 y
# of patients	1,042	559	291	150
Clinical Pregnancy (%)	37	40.2	47.3	37.9	NS
Live Birth (%)	33	34.4	41.5	30.7	NS
Age 38–40 y
# of patients	1,540	550	270	119
Clinical Pregnancy (%)	31	37.6	32.3	28.6	NS
Live Birth (%)	25.7	31.3	27.8	23.5	NS
Age 41–42 y
# of patients	1,076	336	156	70
Clinical Pregnancy (%)	20	22	31.4	25.4	NS
Live Birth (%)	14.9	15.7	20.5	18.3	NS
Age >42 y
# of patients	810	220	102	30
Clinical Pregnancy (%)	8.8	10.9	16.7	6.7	NS
Live Birth (%)	5.7	6.8	10.8	3.3	NS

NS—not significant