Comparison of matching and other variables: heart rate analysis
| IUGR (n = 54) | Controls (n = 54) | |
|---|---|---|
| Values are mean (SD) or percentages. | ||
| IUGR, Intrauterine growth retarded. | ||
| Matched factors | ||
| Sex (male) | 59% | 52% |
| Feeding (breast) | 50% | 31% |
| Maternal smoking (yes) | 50% | 59% |
| Social class | ||
| I or II | 17% | 15% |
| IIIn or IIIm | 57% | 37% |
| IV or less | 26% | 48% |
| Unmatched factors | ||
| Maternal age (years) | 27.5 (5.1) | 26.9 (4.4) |
| Gestation (weeks) | 38.7 (1.5) | 39.8 (1.5) |
| Birth weight (g) | 2633 (405) | 3328 (462) |