ABSTRAKLatar Belakang: Blighted ovum adalah suatu keadaan hasil konsepsi yang tidak mengandung janin. Diperkirakan di seluruh dunia Blighted ovum merupakan 60% dari penyebab kasus keguguran, di ASEAN (association of southeast asian nations) mencapai 51%, di Indonesia ditemukan 37% dari setiap 100 kehamilan, di Provinsi Yogyakarta mencapai 30% dari 100 kehamilan dan di Kabupaten Sleman sebanyak 43,39% (WHO, 2015). Tujuan: Mengidentifikasi faktor yang berhubungan dengan kejadian kehamilan blighted ovum. Metodologi Penelitian: Jenis penelitian ini observasional analitik dengan pendekatan cross-sectional. Waktu penelitian ini dari 27 Maret 2021-12 Agustus 2021. Lokasi penelitian di PKU Muhammadiyah Gamping dengan sampel ibu hamil di PKU Muhammadiyah Gamping sebesar 30 responden, teknik pengambilan sampel Total Sampling. Luaran Yang Ditargetkan : Luaran penelitian ini jurnal nasional terakreditasi sinta 1-6. Hasil Penelitian: Faktor yang berhubungan dengan kejadian blighted ovum pregnancy yaitu faktor usia yang ditunjukkan dengan nilai p-value 0,04 dimana nilai p-value lebih kecil dibandingkan nilai signifikansi dengan tingkat kesalahan 5 % (0.05). Hal ini menunjukkan bahwa terdapat hubungan antara variabel usia dengan kejadian blighted ovum pregnancy. Untuk variabel pengetahuan nilai p-value 0,077 dimana nilai p-value lebih besar dibandingkan nilai signifikansi dengan tingkat kesalahan 5 % (0.05). Hal ini menunjukan bahwa tidak terdapat hubungan antara variabel pengetahuan dengan kejadian blighted ovum pregnancy.Kata Kunci: Hamil, Blighted OvumTHE RELATIONSHIP BETWEEN KNOWLEDGE AND AGE ON THE INCIDENCE OF BLIGHTED OVUM PREGNANCY AT PKU MUHAMMADIYAH GAMPING YOGYAKARTAABSTRACTBackground: Blighted ovum is a state of product of conception that does not contain a fetus. It is estimated that worldwide Blighted ovum is 60% of the causes of miscarriage cases, in ASEAN (association of Southeast Asian Nations) it reaches 51%, in Indonesia it is found 37% of every 100 pregnancies, in Yogyakarta Province it reaches 30% of 100 pregnancies and in Sleman Regency. as much as 43.39% (WHO, 2015). Objective: To identify factors related to the incidence of blighted ovum pregnancy. Research Methodology: This type of research is analytic observational with a cross-sectional approach. The time of this research is from 27 March 2021-12 August 2021. The research location is at PKU Muhammadiyah Gamping with a sample of pregnant women at PKU Muhammadiyah Gamping with 30 respondents, the sampling technique is Total Sampling. Targeted Outcomes: The outputs of this research are national journals accredited by sinta 1-6. Research Results: Factors related to the incidence of blighted ovum pregnancy are age, which is indicated by a p-value of 0.04 where the p-value is smaller than the significance value with an error rate of 5% (0.05). This shows that there is a relationship between the age variable and the incidence of blighted ovum pregnancy. For the knowledge variable, the p-value is 0.077 where the p-value is greater than the significance value with an error rate of 5% (0.05). This shows that there is no relationship between the knowledge variable and the incidence of blighted ovum pregnancy.Keywords: Pregnant, Blighted Ovum