“…Since the subjects were mainly young people, the treatment effects on problem behaviour in older people are not well known. Follow-up data were only presented in 9 of the 16 publications (Fehr & Beckwith, 1989;Friman et al, 1984;Jenson, Rovner, Cameron, Petersen, & Kesler, 1985;Murphy, Ruprecht, Baggio, & Nunes, 1979;Osborne et al, 1992;Peine et al, 1991;Peterson & Peterson, 1977;Reilich, Spooner, & Rose, 1984;Singh, Watson, & Winton, 1986).…”