It is a particular risk for young children, who suffer significant developmental problems if exposed to elevated lead levels.
The team measured the lead levels in each country-category and calculated the lead intake on the basis of daily consumption.
These high lead levels may harm both the mother and developing foetus.
The research also found an increased risk among patients who recorded the highest patella lead levels - but the trend was not significant.
Researchers emphasized that the lead levels found were still relatively low.
When other factors, such as smoking and diabetes were taken into consideration, the risk rose to 3.2 times that of those exposed to the lowest lead levels.
The Boston team investigated whether there was an association between the development of cataracts and lead levels in two bones - the tibia (shin bone) and the patella (kneecap).
The authors have been very cautious and careful to exclude other factors associated with criminality, and the thing that stands out is this rise and fall in lead levels and a subsequent rise and fall in crime.
These bills will curb lead levels in water pipes, a major source of harmful lead exposure for children, and help address diesel engine pollution that is linked to serious health conditions like asthma and heart and lung disease.
An extensive study in 2012 by US magazine Consumer Reports, including rice and rice-based products such as rice cakes and drinks available in the US, measured lead levels even lower, with a majority of samples measuring less than five parts per billion.
In the human female, elevated prolactin levels lead to lower estrogen and progesterone levels.
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Nutrient overloads lead to low levels of dissolved oxygen in the water, which can kill fish.
He also found two chocolate ingredients that inhibit the natural breakdown of anandamide, which could lead to heightened levels of anandamide in the brain.
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Groups favouring stricter immigration laws say the reforms under consideration would exacerbate financial problems for state and local governments and would lead to higher levels of illegal immigration.
The BBC's business editor Robert Peston has suggested that correcting the department's forecast assumptions could lead to required levels of capital that are simply unaffordable for the bidders.
He said problems stemming from HMOs - which critics say lead to higher levels of anti-social behaviour and crime - were not "widespread" and councils were best placed to deal with them.
Early stage delinquencies substantially declined in the third quarter of last year and have remained below 5% for three consecutive quarters, which should lead to lower levels of credit provisions as the older vintage of poor credit quality continues to age and is written off, McClintock wrote.
Hurd was saying he wanted to build an HP that trained executives who could lead at the highest levels.
People were also eating far too much saturated fat, which can lead to high cholesterol levels, and consequently heart disease.
The metals are explosive movers, so be wary that a break of key support levels could lead to much deeper retracements.
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Analysis of commercially available rice imported into the US has revealed it contains levels of lead far higher than regulations suggest are safe.
In declaring the emergency, Peru's Environment Ministry said the contamination included high levels of lead, barium and chromium as well as petroleum-related compounds.
And about eight million or so were due to high levels of lead, and that exceeds the government standard for lead paint on toys.
For example, safety recalls for tainted beef and toys containing high levels of lead have cost investors and consumers millions of dollars this year alone.
Researchers are looking at an old factory in Trenton that has high levels of lead and is smack in the middle of a residential neighborhood.
Mattel issued a safety recall for 1.5m of its Fisher-Price toys (1m of which are in America) because they may contain hazardous levels of lead paint.
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