LOS ANGELES—Children in lower-income families spend more time watching TV and using electronic devices than kids in more affluent homes, according to a survey released Thursday.

The report by the nonprofit group Common Sense Media on the viewing habits of more than 1,400 children nationwide age eight and under found that less-affluent youngsters spend nearly three-and-a-half hours daily watching TV and using varied devices including smartphones, tablets, laptops and video game players.

By comparison, kids in higher-income homes spend just under two hours on such activities. The offspring of better-educated parents also spend less time with media (1 hour, 37 minutes) compared with children of those with less education (2 hours, 50 minutes).

“Before we can begin to understand the impact of media and technology on kids and families, we have to better understand their attitudes and behaviors,” James P. Steyer, the nonprofit group’s CEO and founder, and Reveta Franklin Bowers, chair of its board, said in a preface to the report.

The survey found that Latino parents expressed the most concern about what their children are exposed to in media, including sex, violence and racial and gender stereotypes. African-American parents voiced somewhat less concern, with white parents expressing the least worry among ethnic groups.

But a majority of parents overall said their children’s use of digital media helps boost learning and creativity.

The time youngsters spend reading or being read to has remained steady at 30 minutes daily, compared with previous studies in 2011 and 2013. But fewer than half (43 percent) of children under 2 are read to each day, counter to the American Academy of Pediatrics recommendation that reading to kids should begin at infancy to help develop language and literacy skills.

Nearly half (49 percent) of children are watching TV or using electronic media shortly before bedtime, contrary to the academy’s recommendation of an hour gap between such activities and sleep.

According to its conclusion, the survey “should not be read as a judgment on the quality of children’s time with media; rather, it is a snapshot of how media and technology are infused into daily life. Additional experimental and qualitative work is essential to better understanding the full implications of children’s media use.” /jpv