Global IQ test
Total tested: 7 537 631
IQ test
Average IQ by country
Blog
About us
Propose your research For journalists FAQ
Last update: 08/14/2023 06:01 PM
IQ test Analytics
Physical Activity level Country Dominant Hand Presence of siblings Socioeconomic status Time of Day Age Education Gender Devices Universities Other

Average IQ Based on the Presence of Siblings

In the dynamic study of intelligence quotient (IQ), numerous variables have been explored as potential influences on cognitive ability. One intriguing variable that has garnered attention is the presence or absence of siblings.

High Confidence Level in Data: 1000+
Low Trust Degree Value: <1000
# Presence of siblings Average IQ Number of responses
#1 1 brother or sister 103.22 10000+
#2 Only child 100.94 10000+
#3 2 or more brothers or sisters 98.62 1000+

The Data

1 Brother or Sister - The average IQ for individuals with one sibling stands at 103.22. This suggests a slight advantage over being an only child or having multiple siblings. But hey, if you're in this category, you might have had the balance of companionship and personal space growing up.

Only Child - Individuals without any siblings have an average IQ of 100.94. This is interesting, right? Some might say being the sole recipient of parental attention and resources might have its cognitive benefits. On the flip side, as an only child, perhaps you were your own best competition.

2 or More Brothers or Sisters - Those with two or more siblings show an average IQ of 98.62. But remember, numbers are just one side of the story. Having multiple siblings might mean you've developed other skills like patience, negotiation, or the art of bathroom scheduling!

Factors Potentially Influencing IQ

From a professional standpoint, several factors could be influencing these numbers:

  • Parental Attention: An only child might receive undivided attention from parents, which can affect cognitive and emotional development. On the other hand, having siblings could mean shared attention but also increased social interactions.

  • Learning Environment: Siblings can offer a constant learning environment at home, with older siblings often playing the role of tutor or mentor.

  • Social Skills Development: While cognitive intelligence is vital, emotional intelligence and social skills are equally crucial. Growing up with siblings can offer numerous opportunities for developing these skills. 

  • Economic Factors: Larger families might face economic constraints, which could limit access to educational resources or extracurricular activities.