Prevalence of cerebral palsy with Gross Motor Function Classification System levels IV and V in children in Israel: a cross-cultural comparison

PURPOSE

Cerebral palsy is the most common physical disability in childhood. Our aim was to study the prevalence of wheelchair-dependent cerebral palsy (equivalent to gross motor function classification system level IV/V) among Jewish and Arab children in Israel and to investigate differences between the children of the two population groups.

METHODS

Children diagnosed with cerebral palsy born in the years 2005-2006 were located through the Israel National Insurance Institute database. Demographic and clinical data were retrieved from children's records.

RESULTS

Overall prevalence in Israel was 0.8 (0.7-0.9) per 1000 live births. The prevalence was significantly higher among Arabs (1.2:1000) than Jews (0.6:1000; OR = 1.6, 95% CI 1.2-2.1, p = 0.001) and was highest among Arabs in the South (Bedouins) (2.8:1000). Consanguinity among parents and low socioeconomic status were significantly more common among Arab children with wheelchair- dependent cerebral palsy compared with Jews. Higher rates of children with cerebral palsy following term pregnancy were found in Arabs. Extreme preterm births, very low birth weight, and emergent cesarean section were more common among Jews compared with Arabs.

CONCLUSIONS

This study revealed population group differences of cerebral palsy with Gross Motor Function Classification System levels IV and V. Higher rates of cerebral palsy, especially following term pregnancy in the Arab population, may be attributed to consanguinity and genetic factors. There is a need to tailor services to underserved population based on etiology: preterm births and genetic causes for the Jewish and Arab populations, respectively.

Reduction of the temperature dependence of the nonreciprocal effect of magneto-optic channel waveguides

The nonreciprocal effect is the difference Deltabeta = beta(forward)-beta(backward) between forward and backward-propagation constants of optical modes. This effect is analyzed for the fundamental TM00 mode of channel waveguides in epitaxially grown magnetic garnet films. To increase |Deltabeta|, double layers with opposite signs of Faraday rotation are used to prepare the waveguides. It is shown that the temperature dependence of Deltabeta can be reduced considerably if the layer with positive Faraday rotation, which is at room temperature close to the Curie point, is replaced by a paramagnetic layer with negligible Faraday rotation. Concurrently, however, |Deltabeta| is decreased by approximately 35% at 295 K.