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Unexplained Differences (unexplained + difference)

Distribution by Scientific Domains

Business, Economics, Finance and Accounting	50%

Selected Abstracts

Ethnic Differences in Birth Outcomes in England,

FISCAL STUDIES, Issue 1 2006
Lorraine Dearden
Abstract This paper uses the Millennium Cohort Study to look at ethnic differences in birth outcomes for a cohort of English children born in 2000 and 2001. There is an increasingly large literature showing that longer gestation and higher birthweight are positively associated with cognitive and non-cognitive outcomes later in life, so understanding sources of ethnic differences in these outcomes and identifying factors that may influence birth outcomes has a lot of potential policy interest. This paper shows that even after controlling for background characteristics in a number of ways, there still remain unexplained differences in both gestation and birthweight outcomes across broad ethnic groups. It also suggests, however, that there may be potential policy levers that could be used to narrow this ethnic gap in birth outcomes, such as reducing the proportion of underweight Asian mothers and overweight Black mothers and increasing ethnic minority attendance at antenatal classes. [source]

Occupational Attainment and Earnings: The Case of the Disabled

LABOUR, Issue 3 2004
Peter Skogman Thoursie
It extends the traditional wage decomposition by incorporating explained and unexplained differences in occupational attainment. Data from the Swedish Level of Living Survey for 1981 and for 1991 have been used. The results show that in both years the disabled worked in low-level occupations to a greater extent relative to the non-disabled. This is due to the fact that disabled workers have lower qualifications. The unexplained component due to differences in returns on wage determinants is insignificant in the 1981 case but is highly significant in 1991, constituting around 50,60 per cent of the average log wage differential. [source]

Impact of Nanoscale Confinement on Crystal Orientation of Poly(ethylene oxide)

MACROMOLECULAR RAPID COMMUNICATIONS, Issue 4 2010
Haopeng Wang
Abstract Using a layer-multiplying coextrusion process to fabricate films with thousands of alternating polymer nanolayers, we report here a new crystalline morphology in confined polymer nanolayers and an abrupt transition in the crystallization habit. At higher temperatures, poly(ethylene oxide) crystallizes as large, in-plane lamellae. A 5,°C change in the crystallization temperature produces an on-edge lamellar orientation. The results point to a transition from heterogeneous nucleation to substrate-assisted nucleation. This may be a general phenomenon that accounts for previously unexplained differences in the preferred chain alignment of confined polymer crystals. [source]

Computer-assisted dosage calculation for strabismus therapy in myopic patients

ACTA OPHTHALMOLOGICA, Issue 1 2008
Martina Koch
Abstract. Purpose:, The published dosage recommendations for the surgical correction of horizontal strabismus in non-myopic patients show large, unexplained differences. For patients with high myopia, the situation becomes even more complex because the increase in the size of the bulb also affects the geometry of the oculomotor muscles. In this study, we wanted to investigate whether computer simulations of the oculomotor plant can be used to find accurate surgical parameters. Methods:, In a retrospective study, we investigated pre- and postoperative strabismus patterns in 13 patients affected by convergent (seven patients) or divergent (six patients) strabismus and high myopia. Postoperative checks were made 1 day, 1 week, 3 months and 1,6 years after the operation. For each patient, we simulated the presurgical strabismus pattern with SEE++ (see ,Further Information' for manufacturer details), a biomechanical simulation program of the oculomotor plant. The individual results of the simulations were then compared to the measured postoperative strabismus patterns. Results:, We found a trend of under-correction in the postoperative situation, resulting in four patients having a large remaining strabismus angle of more than 5 degrees. The computer simulations were able to reproduce this under-correction, and suggested an increase in dosage. Conclusion:, We conclude that realistic biomechanical simulations of the oculomotor plant can predict the postoperative result for myopic patients accurately. The results of the computer simulation correlate well with the postoperative outcome of the patient. [source]