This paper reports school attendance for 336 chronically ill, Medicaid-eligible children living in rural areas of northern Florida. Demographic data were obtained by a questionnaire administered in a home interview. Attendance data were collected directly from the schools. The mean number of days absent the previous year was 16.9; the mean percentage of days absent was 9.4%. Regression analysis indicated that lower education level of parents and the child's inability to participate in physical activities were significant in predicting days missed from school. No individual diagnostic category was predictive of school absence. Thus, the chronicity of an illness and its impact on the child may be a more significant influence on school attendance than the actual diagnosis of the illness.

Abstract. Let X be a normal projective Q-Gorenstein variety with at worst logterminal singularities. We prove a formula expressing the total stringy Chern class of a generic complete intersection in X via the total stringy Chern class of X. This formula is motivated by its applications to mirror symmetry for Calabi-Yau complete intersections in toric varieties. We compute stringy Chern classes and give a combinatorial interpretation of the stringy Libgober-Wood identity for arbitrary projective Q-Gorenstein toric varieties. As an application we derive a new combinatorial identity relating d-dimensional reflexive polytopes to the number 12 in dimension d ≥ 4.

Let be a -dimensional lattice polytope containing exactly one interior lattice point. We give a simple combinatorial formula for computing the stringy -function of the -dimensional canonical toric Fano variety associated with . Using the stringy Libgober– Wood identity and our formula, we generalize the well-known combinatorial identity which holds for -dimensional reflexive polytopes .

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Пусть $\Delta$ - $3$-мерный целочисленный многогранник, внутри которого лежит ровно одна целая точка. В статье дается простая комбинаторная формула для вычисления струнной $E$-функции канонического $3$-мерного торического многообразия Фано $X_{\Delta}$, ассоциированного с многогранником $\Delta$. С помощью этой формулы и струнного тождества Либгобера-Вуда получено обобщение комбинаторного тождества $\sum_{\substack{\theta \preceq \Delta\dim (\theta) =1}}v(\theta) \cdot v(\theta^*) = 24$, широко известного для случая $3$-мерных рефлексивных многогранников $\Delta$. Библиография: 18 наименований.