The number of fetuses below the 5th and 10th percentile based on standard birth weight norms was not significantly different between preterm and term pregnancies (3 vs 1 and 5 vs 2; P =.37 and P =.27).
These findings suggest the importance of regional birth weight norms to identify and define risk factors for higher risk births.
Likewise, comments and attitudes towards health by elderly people living in the community may affect adolescents' weight norms.
Social comparison is likely to play an important role in the development of societal weight norms, resulting in the threshold for perceived overweight rising in line with increasing weight in the population.
Prolonged pressure from their social and cultural environment may affect adolescents' weight norms, and may play an important role in adolescents setting their own weight standards, no matter whether these standards are healthy or unrealistic [ 25, 26].
While many of these changes are related to shifts in the type of labour in demand due to broader changes to the macroeconomy, and changes to patterns of regular consumption, social influence on health behaviours and changing weight norms are clearly highly salient factors.
Some studies suggest that prenatal ultrasound may provide more accurate dates, even when the last menstrual period is recalled with apparent certainty.[ 31, 32] Thus, some investigators advocate use of ultrasound to generate birth weight norms.[ 25] Nevertheless, the use of ultrasound reference data has several problems.
For and a weight, the weighted norm of over is denoted by (1.6).
The following two-weight norm inequality for the potential operator P applied to differential forms appears in [1].
