Gallup conducts an annual survey of 1,000 Americans which includes a question regarding the morality of animal testing. People for the Ethical Treatment of Animals (PETA) looked at the survey results from 2001 to 2013, and found that the number of respondents who feel that animal testing is morally wrong has increased significantly since 2001. The change was most pronounced among women, and people under 30.

[Abstract excerpted from original source]

“Researchers from PETA and Western Governors University examined data collected in independent surveys by the Gallup organization from 2001 to 2013, in which approximately 1,000 American adults each year were asked whether they found “medical testing on animals” to be “morally acceptable” or “morally wrong.” The researchers found that 41 percent of adults overall found medical testing on animals to be morally wrong in 2013, a small increase since 2012 and a 12 percent increase since 2001. Among adults ages 18 to 29, opposition to medical testing on animals was 54 percent in 2013, an increase of 23 percent since 2001. Opposition increased slightly among older adults since 2012—about one-third of adults 30 and over oppose animal testing. A majority of women — 52 percent — also found medical testing on animals to be morally wrong, an increase of 9 percent from 2012 and 16 percent since 2001. Thirty percent of males opposed animal testing in 2013. Opposition to animal testing rose significantly among all political affiliations since 2001.”