The effect of the standard contrasts (SC) of residual DEE (a) and SC of residual RMR (b) on the SC of residual MLSP. an = 83, SC of residual MLSP = − 7.61 − 8.53 SC of residual DEE, r2 = 0.025, F = 2.08, P = 0.153; bn = 232, SC residual MLSP = − 0.00050 − 0.000 SC residual RMR, r2 = 0.000, F = 0.00, P = 0.997