Table 3. Linear regression models of the effect of FSH dose on COS outcomes, at different maternal age intervals
Group	≤35 years old		36-38 years old		39-40 years old		>40 years old
Variable	RC	p	RC	p	RC	p	RC	p
COS outcomes
Aspirated follicles	-0.004	NS	-0.003	NS.	0.000	NS	0.001	NS
Retrieved oocytes	-0.002	NS	-0.001	NS	0.000	NS	0.000	NS
Oocyte Yield	0.003	0.002	0.003	NS	0.003	NS	0.000	NS
Mature oocytes MII	-0.002	NS	-0.001	NS	0.000	NS	0.000	NS
Mature oocytes rate	-0.001	NS	-0.002	NS	0.002	NS	-0.001	NS
Note: COS: controlled ovarian stimulation; RC: regression coefficient, NS: non-significant (p>0.05).