One of the most comprehensive studies ever conducted followed 1,000 New Zealanders from birth to age 32. Researchers measured self-control (patience) at ages 3-11, then tracked outcomes decades later:
•Income — 32% of the lowest patience group earned under NZ$20,000 annually vs. only 10% of the highest patience group
•Criminal conviction — 43% of the least patient group had a criminal record by age 32 vs. 13% of the most patient group
•Substance dependence — 10% of low-patience individuals developed dependency vs. 3% of high-patience individuals
•Physical health — 27% of the low-patience group had multiple health issues vs. 11% of the high-patience group
The study controlled for IQ and socioeconomic background—patience independently predicted these outcomes regardless of intelligence or wealth at birth.