Childbearing is on the decline in the United States overall and among women under age 30
and women in each of the largest race and Hispanic origin groups. Childbearing continues …

Microplastics are not microplastics are not microplastics, just like pesticides are not pesticides
are not pesticides.“Microplastics,” like other classes of chemical contaminants, is a catch-…

Vitamin D deficiency is an increasingly described phenomenon worldwide, with well‐known
impacts on calcium metabolism and bone health. Vitamin D has also been associated with …

DHHS publication ; no. (PHS) 2014–1120 Objectives: This report presents 2011 data on US
births according to a wide variety of characteristics. Data are presented for maternal …

This report presents 2001 data on US births according to maternal demographics (age, live-birth
order, marital status, race, Hispanic origin, and educational attainment); maternal …

… On and above the Earth's surface, the IGRF model represents the geomagnetic field B(r, θ,
φ, t) produced by internal sources in terms of a scalar potential V(r, θ, φ, t). We then have B=−…

The Functional Independence Measure (FIM) records the severity of disability of rehabilitation
patients. The necessarily curvilinear relationship between the finite range of recorded FIM …

… The OLS and quantile regression estimates, shown in the first row of panel B of table 6,
indicate that entrepreneurs returning to paid employment actually earn a higher wage than …

… On and above the Earth’s surface, the magnetic field \( \overrightarrow {B}\) is defined in
terms of a magnetic scalar potential V by \(\overrightarrow {B}=-\nabla V\) and where in spherical …

Background Hyperglycaemia is associated with increased risk of cardiovascular complications
in people with type 2 diabetes. We investigated whether reduction of blood glucose …