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An Only Child versus a Child with a Sibling: Difference In Perfectionism and the Big Five Personality Traits

Declining fertility and rising
numbers of only children necessitate understanding
their specific characteristics. The main objective
of the present research study is to map the area of
sibling constellations. It focuses on perfectionism
and the Big Five personality traits. METHODS: Online
data were collected from 1,384 Slovak participants
aged 15-74 (133 only children, 1,251 with siblings)
using the Frost Multidimensional Perfectionism Scale
(FMPS) and the Big Five Inventory (BFI 10). Mann-
Whitney U tests compared groups, with effect sizes
(AUC) calculated. Spearman’s correlation examined
variable relationships. RESULTS: Analysis of data
showed that, within our research sample, an only child
achieved significantly higher scores for neuroticism
(p = 0.012) and perfectionism (p = 0.008) , while the
agreeableness (p = 0.035) and conscientiousness
(p = 0.014) scores were lower. No difference was
observed for the personality traits of extraversion
and openness. The strongest relation observed in the
research, obtained through analysis of the correlations
between the individual factors, was the positive
relationship between neuroticism and concern over
mistakes and doubts about actions (r = 0.48).

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