Appraisal of cowpea cropping systems and farmers’ perceptions of production constraints and preferences in the dry savannah areas of Nigeria

Table 4 Binary logit outputs on variables influencing the use of cowpea cropping system

Variable (see Table 1)	B	SE	Wald	Sig	Exp(B)
Constant	2.982**	1.006	8.790	0.003	19.731
Age	− 0.292*	0.113	6.671	0.010	0.747
Education	0.274	0.232	1.405	0.236	1.316
Experience-cowpea	0.036	0.121	0.090	0.764	1.037
Extension-Contacts	0.203	0.153	1.762	0.184	1.225
Fertilizer use	− 0.893**	0.298	9.011	0.003	0.409
Field days	0.387*	0.181	4.546	0.033	1.472
Gender	− 1.507***	0.342	19.446	0.000	0.222
Household-size	0.003	0.013	0.069	0.793	1.003
Status	0.054	0.546	0.010	0.921	1.056

*P < 0.05; **P < 0.01; N = 420; B = coefficient for the constant (or the “intercept”), SE = standard error around the coefficient for the constant, Wald = Wald chi-square test, Sig. = statistical significance of the test, and Exp (B) = exponentiation of the B coefficient, which is an odds ratio

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