“…Various other studies enter figures from their own samples, generally repeating Kempe's findings (Birrell & Birrell, 1968;Cameron, Johnson, & Camps, 1966;Ebbin, Gollub, Stein, & Wilson, 1969;Elmer & Gregg, 1967;Gregg & Elmer, 1969;Heifer & Pollock, 1967;Johnson & Morse, 1968;Nurse, 1964;Schloesser, 1964;Skinner & Castle, 1969). Elmer (1967) and Young (1964) add to Kempe's findings the factors of social and economic stress, lack of family roots in the community, lack of immediate support from extended families, social isolation, high mobility, and unemployment.…”