http://www.nber.org/papers/w14920"Which Immigrants Are Most Innovative and Entrepreneurial? Distinctions by Entry Visa"
"Using the 2003 National Survey of College Graduates, I examine how immigrants perform relative to natives in activities likely to increase U.S. productivity, according to the type of visa on which they first entered the United States.
Immigrants who first entered on a student/trainee visa (J-1 or F-1) or a temporary work visa (H-1B) have a large advantage over natives in wages , patenting, commercializing or licensing patents, and publishing. In general,
this advantage is explained by immigrants' higher education and field of study , but this is not the case for publishing, and immigrants are more likely to start companies than natives with similar education. Immigrants without U.S. education and who arrived at older ages suffer a wage handicap, which offsets savings to the United States from their having completed more education abroad. Immigrants who entered with legal permanent residence do not outperform natives for any of the outcomes considered. "
That was all that was available of that study unless you purchase it.
One article about this study was "US work visa holders are more productive than US citizens says report" at
http://www.globalvisas.com/news/us_work_visa_holders_are_more_productive_than_us_citizens_says_report1077.html"Hunt looked at factors such as whether the immigrants have launched patents, contributed to major conferences and published books or papers. She also looked at what they earned and concluded that the highest achievers moved to the US on temporary highly skilled work visas (H-1B) or to train or study in the US."
"Hunt said she attributed the higher achievement to the tendency to study in more lucrative fields, along with the fact that many of them were educated to an extremely high level."
I didn't see anything about the comparative level of wages of H-1B visa holders when they are first hired. The study seems (without buying it) to contend that their earnings and productivity were comparatively high over a period of time.