Personality traits are effective in human decision-making, and researchers try to investigate the role of personality in people's choices, and deciding when to get pregnant in women is one of these choices. Therefore, the purpose of the present study was to determine and investigate the relationship between personality types and the age of first pregnancy in women referred to hospitals affiliated to Shiraz University of Medical Sciences.

The present descriptive-analytical cross-sectional study was conducted in 2018 on 210 eligible mothers in three hospitals affiliated to Shiraz University of Medical Sciences. The sampling method was available sampling from all three centers with appropriate allocation. In the present study, the personality questionnaire and the personal information questionnaire were completed by the mothers. Collected data were analyzed using Spearman's statistical test.

The highest score related to the personality trait of conscientiousness with an average score of 39.68±6.09 and the highest frequency was correspondingly related to the personality trait of conscientiousness (48.1%). The results indicated that the correlation value of the two variables extraversion and the age of the first pregnancy is significant with a correlation of 0.17 with a significance level of 0.014 and openness to experience and the age of the first pregnancy with a correlation of 0.25 with a significance level of 0.049, which are less than the assumed error in the research, 0.05.

The results of this research indicated that in consort with various factors that can delay childbearing and increase the age of first pregnancy in mothers, some personality traits of mothers were similarly influential. Therefore, identifying personality traits and training mothers can be effective.