Fig. 1

Observations on etiologic classification and pregnancy outcomes of the involved subjects. a For the 114 GnRH-a-related spontaneous pregnancies that could be followed up, 65 (57.02%) pregnancies resulted in live births, and another three (2.63%) pregnancies are ongoing. The remaining 46 (40.35%) pregnancies were lost as a result of ectopic pregnancy (15.79%) or spontaneous abortion (24.55%). b According to etiologic classification, the involved 114 subfertile couples consisted of 47 (41.23%) tubal damage cases, 27 (23.68%) sperm disorder cases, 14 (12.28%) recurrent spontaneous abortion (RSA) cases, 11 (9.65%) polycystic ovary syndrome (PCOS) cases, 6 (5.30%) endometriosis cases and 9 (7.89%) idiopathic infertile cases, respectively. c The subfertile cases with distinct etiologies were calculated separately based on the classification of pregnancy outcome. Tubal damage cases represented the main component in those groups. Furthermore, the proportion of tubal damage cases in ectopic pregnancies (61.11%) and the group of birth defects (66.67%) were higher than in other groups