| Variables | A | B | C | D | E | F |
| Participants ■ Family | ||||||
| Age | Thirties | Thirties | Thirties | Thirties | Thirties | Thirties |
| Family structure | Nuclear households | With grandparents | Nuclear households | Nuclear households | Nuclear households | |
| Sibling (Years old) | 1 | 3 | None | None | 2 | |
| Working | Unemployed | Part-time | Part-time (Taking a break) | Regular employee | Regular employee | Regular employee |
| Main rearer | Mother | Mother & Father | Mother | Mother | Father | Mother |
| Child using Little Baby Handbook | ||||||
| Age (Years old) | 3 | 6 | 1 | <1 | 5 | |
| Sex | Male | Female | Male | Male | Male | |
| Birth weight (g) | 863 | 1134 | 689 | 631 | 686 | |
| Gestational age (Weeks) | 28 | 30 | 24 | 26 | 25 | |
| NICU hospitalization (Months) | 3 | 2 | 4 | 4 | 8 | |
| Medical care | None | None | None | None | Shunt | |
| Medical welfare service | Outpatient Rehabilitation Center | Outpatient Rehabilitation Center Rehabilitation Center | Outpatient Rehabilitation Center | None | Outpatient Rehabilitation Center | |
| Disability certificate | Treatment and Education Certificate | None | None | None | Treatment and Education Certificate | |