(Pope Francis blesses the altar during Ash Wednesday at Santa Sabina Basilica in Rome March 5, 2014. REUTERS/Max Rossi )

One year after his election, Pope Francis is “immensely popular among American Catholics,” a survey said on Thursday, but there is no sign of a “Francis effect” inspiring more to attend Mass or do volunteer work.

The Washington-based Pew Research Center said 85 percent of Catholics in the United States viewed the Argentine-born pontiff favourably, with 51 percent reporting a “very favourable” view of him, while only 4 percent expressed a negative opinion.

Among Catholics, 68 percent thought he represented “a major change for the better,” a view shared by 51 percent of the non-Catholics responding to the poll in telephone interviews of 1,340 Americans from February 14 to 23.

But the poll also found the rock-star status of the pope, whose simple style has attracted record crowds to the Vatican and won Time magazine’s Man of the Year title for 2013, has not clearly translated into greater lay participation in the church since his surprise election on March 13, 2013.