J Med Assoc Thai 2002; 85 (1):97

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The Birth Order and Personalities of Medical Students
ChanOb T Mail, Boonyanaruthee V , Pinyopompanich M , lntaprasert S , Kuntawongse N

VUDHICHAI BOONYANARUTHEE, M.D.*,
SUTHI INTAPRASERT, M.P.A., M.S.W. *,
The purpose of this study was to determine how birth position i.e. first-born, middle-born,
lastbom, and only child, correlates with personality.
Material and Method: One hundred and eighty from 186 (97%) 1st year medical students
of Chiang Mai Medical School were asked to complete a questionnaire and take a personality test.
The data obtained included age, sex, Grade Point Average (GPA), and family background i.e. birth
order and the students' personality profiles, which were assessed by the California Psychological
Inventory (CPI).
Results: The results showed that only children and lastbom had more positive personality
factors than other groups. They had more ambition, breadth of interests, versatility, self confidence,
clear-thinking, intelligence, and independence than first-born and middle-born (Cs and Ai scale on
CPI) .. In addition, the students whose parents had died, separated, or divorced had some personality
profiles that differed from the others. The findings both supported and contradicted other papers.
Key words : Birth Order, Medical Student, Personality

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