In Tanzanian and Sudanese students, the TPB components, moral norms, and past behaviour were statistically significantly associated with intention. In Tanzanian students, Pearson's correlation coefficients ranged from r = .52 between attitudes and intention to r = .14 between past behaviour and intention. In Sudanese students, Pearson's correlation ranged from r = .54 between intention and attitudes to r = .03 between intention and past behaviour. Table 3 depicts the results from hierarchical linear regression analysis assessing the fit of the extended TPB model among Tanzanian and Sudanese students. Country and past behaviour were entered in the first step explaining 15.7% (R 2 change = 0.157, p < 0.001) of the variance in intention. Adding attitudes, subjective norms and perceived behavioural control in step 2 increased the explained variance by 33.4% (R 2 change = 0.334 p < 0.001). Moral norm added in step 3 raised the explained variance by 2.3% (R 2 change = 0.023 p < 0.001). A total of 6 variables accounted for 51.4% of the variance in intention (43.7% and 43.9% in Tanzania and Sudan, respectively). In the final equation, attitude was by far the strongest predictor of intention (beta = 0.35), followed in descending order by subjective norms (beta= 0.22), moral norm (beta= 0.17), perceived behavioural control (beta = 0.16) and past experience (beta = 0.06). The effect of country (beta = 0.35, p < 0.001) in step 1 was reduced to (beta = 0.04, p = 0.099) in the final third step, whereas the strength of the effect from past behaviour was maintained from step 1 (beta= 0.08, p < 0.001) to step 3 (beta= 0.06, p < 0.001). Statistically significant two-way interactions occurred, in terms of country × attitudes (R 2 change 0.007, F change = 13.7, p < 0.001) and country × subjective norms (R 2 change 0.009, F change = 17.0, p < 0.001). Stratified analyses suggested that the relationship between attitude and intention and between subjective norms and intention were statistically significantly stronger in Sudanese-than in Tanzanian students.