Typical development of quantity comparison in school-aged children

Although basic numerical skills have been widely studied in the last years, very few studies have undertaken a developmental approach. The present study evaluated the development of the magnitude comparison basic numerical ability, in children from first, third and sixth grades by means of the subject's response time in numerical tasks presented in symbolic and non-symbolic formats. The results showed a significant decrease on quantities processing speed as age increases, which suggests numerical skills tend to become automatic with instruction. The differences found, concerning the general achievement pattern in each school year, might express the maturational specificities of the numerical representation system through development.     

Spanish adaptation of the NDSS (Nicotine Dependence Syndrome Scale) and assessment of nicotine-dependent individuals at primary care health centers in Spain

The availability of adequate instruments for the assessment of nicotine dependence is an important factor that is relevant in the area of tobacco addiction. In this study, we present a Spanish validation of the Nicotine Dependence Syndrome Scale (NDSS) (Shiffman, Waters, & Hickcox, 2004). The sample was composed ofpatients, all daily smokers, who visited their General Practitioner (GP) at five Primary Health Care Centers in different cities of Spain (N = 637). The results indicated adequate reliability for the general factor that assesses nicotine dependence (NDSS-Total) (Cronbach's alpha = .76). Factor analysis confirms the five factors of the original validation: Drive, Continuity, Stereotypy, Priority, and Tolerance. It must be noted that reliability is adequate for the first, and moderate or low for the rest. The NDSS-T and its scales correlate significantly with the Fagerstr?m Test for Nicotine Dependence (FTND), with the nicotine dependence criteria of the Diagnostic and Statistical Manual of Mental Disorders IV (DSM-IV) as assessed through the Structured Clinical Interview for DSM-IV (SCID), with carbon monoxide levels in expired air (CO), and with the number of cigarettes smoked. The ROC curve indicates that the NDSS-T has a score of .79 which is under the curve (.69 for the FTND), thus the prediction of nicotine dependence is adequate. We conclude that this instrument is useful (in terms of its total score NDSS-T) for assessing nicotine dependence for Spanish smokers (in Spain), as has been found in other countries, language groups, and cultures.     

Family Care Behaviors and Early Childhood Development in Low- and Middle-Income Countries

Epidemiological evidence linking early childhood development (ECD) with family care behaviors is limited. This study assessed relationships of ECD with family care behaviors and child nutritional status in 77,315 children 36–59 months from 26 low- and middle-income countries from the Multiple Cluster Indicator Surveys round 4. We used UNICEF-recommended indicators for literacy–numeracy and learning development. Family care behaviors measured were provision of books and play materials, inadequate care, activities of adult caregivers with child, father’s involvement, attendance to early childhood education program, and violent discipline. Nutritional status was measured by height-for-age z-scores. Three-level linear mixed-model regression analysis was done separately for each ECD outcome. Both developmental domains were associated with family care behaviors, with strongest associations between literacy–numeracy and program attendance, provision of books, and stimulating activities. Differences in the proportion on track for literacy–numeracy were 0.176–0.277 for these three family care behaviors. The multivariable model controlling for maternal education and wealth showed that children with provision of books, program attendance, and four stimulating activities had a proportion of being on track for literac–numeracy that was 0.427 higher than children without these. Higher height-for-age was associated with higher prevalence of being on track for literacy–numeracy and learning development. This study provides epidemiological evidence on the importance of family care behaviors for ECD. ECD could be substantially fostered by interventions that promote appropriate family care behaviors and resources for learning stimulation even in contexts of socioeconomic and educational disadvantage.