Figures on commitment to Christ are based on 2,556 interviews conducted in March and April 1988, with a 2-point margin of error. The 1978 figures are based on at least 1,500 interviews, with a 3-point margin of error. The remaining figures are based on 1,509 in-person interviews conducted with adults 18 and over in January 1983, with a 3-point margin of error.