Purnami, S. W.; Aida, F. N.; Sutikno, S.; Herowati, D.; Sjafii, A.; Wibisono, S. P.; Mayliawati, A. SURVIVAL ANALYSIS TO DETERMINE AGE TO GIVE FIRST BIRTH IN WOMEN IN EAST JAVA USING EXTENDED COX REGRESSION. JBK 2021, 10, 144-152.