LANCASTER, Pa. (AP) — Conservative Amish groups have larger families than other Amish and their children are far less likely to leave the church, a trend that is expected to bring dramatic changes for them in the coming years, according to a book on the distinctive religious group being published this week.

“The Amish,” a 500-page overview of the Christian followers known for traditional dress and the use of horse-and-buggy transportation, identified 40 distinct groups and a variety of permitted practices.