Table 1. Sample Characteristics by Main Groups
0,358 pt Category Natural cycle Artificial cycle p value
Age 38.4 (3.34) 39.0 (3.48) 0.559
BMI 24.5 (23.8) 24.9 (23.4) 0.117
Birth weight 3150 (465) 3306 (437) 0.143
Embryo stage 4 12 (4.0) - 0.016
5 162 (54.2) 76 (25.4)
6 28 (9.4) 21 (7.0)
Endometriosis 13 (4.4) 11 (3.7) 0.151

Continuous data (age, BMI, and neonatal weight) are expressed as mean ± standard deviation (t-tests).
Categorical data are expressed as frequencies and percentages (chi-square test).
The p-value in bold indicates a statistically significant difference between natural and artificial cycles