Table 2 Univariate Analysis of Model 1,,,,,, Explanatory variables,Estimates,Standard errors,Degrees of freedom,Scaled deviance,t-statistics,Sig. at 0.05 Constant,–9.2260,0.3480,49,49,–26.55,Yes QNMm,0.9835,0.0334,,,29.42,Yes Constant,–1.2210,0.2160,49,49,–5.64,Yes QNMn,0.2490,0.0243,,,10.26,Yes Constant,–0.7520,0.2580,49,49,–2.92,Yes QMm,0.1943,0.0288,,,6.76,Yes Constant,–2.0910,0.3790,49,49,–5.51,Yes QMn,0.3877,0.0478,,,8.12,Yes Constant,0.8636,0.0748,49,49,11.54,Yes QPED,0.0357,0.0237,,,1.51,No Constant,–3.6760,0.1090,49,49,–33.63,Yes SPEED,0.0771,0.0018,,,42.83,Yes Constant,3.2900,1.1800,49,49,2.79,Yes LWm,–0.6510,0.3290,,,–1.98,Yes Constant,3.0200,1.0500,49,49,2.88,Yes LWn,–0.5800,0.2950,,,–1.97,Yes Constant,1.1960,0.1260,49,49,9.47,Yes LNm,–0.1023,0.0519,,,–1.97,Yes Constant,1.0780,0.1200,49,49,8.97,Yes LNn,–0.0744,0.0697,,,–1.07,No Constant,1.0020,0.1280,49,49,7.83,Yes NL (2),–0.0294,0.0826,,,–0.36,No Constant,1.0578,0.0524,48,48,20.17,Yes SHDW (2),–0.1812,0.0856,,,–2.12,Yes SHDW (3),–0.2750,0.1190,,,–2.32,Yes Constant,0.8316,0.0752,49,49,11.05,Yes LU (2),0.1774,0.0885,,,2.01,Yes Note: Estimates for factors (2) and (3) are the differences compared with the reference level (1).,,,,,,