One significant challenge facing the Filipino youth today is adolescent pregnancy, as the nation having one of the highest rates of adolescent births rates in the ASEAN region. Various sociocultural, economic, and individual factors have been identified as contributing factors. However, the impact of family, including maternal intergenerational factors, has yet to be substantially explored. This study aimed to investigate the root cause of adolescent pregnancy in San Juan city through the identification and examination of common familial factors.

This was an unmatched case-control study with a 1:2 ratio using a non-probability sampling. It included two groups of adolescent females: pregnant/ever pregnant and non-pregnant) aged 13 to 19. A three-part modified questionnaire was used to collect the data and was administered through a faceto-face interview.

This study revealed that adolescent women in grandparent-headed families are 4.47 (CI: 1.33, 15.0) times more likely to be pregnant as adolescents compared to the reference group. Adolescents with low educational attainment among their fathers and mothers are 4.25 (CI: 1.80, 10.10) and 3.30 (CI: 1.58, 6.93) times more likely to get pregnant, respectively. Additionally, if a mother is unemployed, they were 1.89 (CI: 1.09, 3.30) times more likely to get pregnant, and if their mother passed away, they were 4.24 (CI: 1.03, 17.42) times more likely to experience pregnancy. Moreover, they are 7.69 (CI: 4.21, 14.02) and 9.07 (CI: 2.74, 30.03) times more likely to get pregnant if their mother and sister have a history of adolescent pregnancy. There was also a significant association found between severe family dysfunctionality (p=0.0430) and adolescent pregnancy. Cases were 8.33 times less likely to have a severely dysfunctional family than controls.

A statistically significant association was found between adolescent pregnancy and several familial factors, including exposure to a grandparent-headed family structure, low parental educational attainment, maternal unemployment, maternal death, and a family history of early pregnancy involving the mother or an older sister. While moderate family dysfunction was also associated, this relationship was not statistically significant.