Table 5. Internal consistency for gender. Cronbach’s Alpha Spanish sample (N = 613) Luxembourgish sample (N = 752) Subscale Boys (N = 309) Girls (N = 304) Boys (N = 343) Girls (N = 409) Attitude toward PA .910 .901 .913 .914 Perceived parental socialization .931 .932 .925 .926 Perceived physical competence .942 .939 .952 .950 Perceived resources support .726 .738 .713 .722