Weight Increase of Twins and Singletons in the First Year of Age

bal cognitive abilities, birth weight, and minimal brain injury. A total of 45 (20 MZ and 25 DZ) twins pairs of both sexes were matched with 90 singletons of the same age, sex, and schooclass. All subjects were Israeli kibbutzl born youngsters, and as such were all of the same social background. The following data were acquired for all subjects: period of gestation, type of delivery, birth weight, and physical development after birth. Additional data in the case of the twins: birth order and type of twinning. All subjects took the Raven Progressive Matrices, the Kohs Blocks (nonverbal intelligence tests), and the verbal scales of the WISG. The Bender-Gestalt test and neurological examinations (including fine motor coordination, gross motor coordination, motor impersistance, associated movements, equilibrium, different sensory functions) were also given in order to detect indications of possible brain injury.