Intercropping Cedrela odorata with Shrubby Crop Species to Reduce Infestation with Hypsipyla grandella and Improve the Quality of Timber

Table 3

P values (P) estimated by the Wald-Chi-Test to test for differences in the fraction of infested trees per plot between pairs of treatments within each time period. Tests were carried out using simple contrasts. Significant results with P > 0.05 are presented in bold. Exp(β) can be interpreted as the odds of being infected by H. grandella compared between treatment 1 and treatment 2 (Exp(β) = odds of tree being infected in treatment 2/odds of being infected in treatment 1; 𝑁=4 per treatment and time period). For abbreviations see Table 1.

Age (months)		6		6–9		9–12		12–15		15–18		18–24
Treatment 1^1 versus treatment 2		P	Exp(β)	P	Exp(β)	P	Exp(β)	P	Exp(β)	P	Exp(β)	P	Exp(β)
G-P^2 versus	FP	0.36	1.76	0.26	0.61	0.11	2.74	0.00	10.31	0.00	5.80	0.37	3.10
	C	0.35	0.58	0.01	0.37	0.44	0.64	0.06	3.55	0.00	9.98	0.33	0.39
	B-R-R	0.27	0.45	0.70	0.80	0.83	1.17	0.02	5.40	0.03	3.22	0.69	1.52
	M-B-M-M	0.06	0.28	0.14	0.39	0.16	0.47	0.07	3.24	0.12	2.01	0.28	0.34
	B-R-R	0.42	1.62	0.33	2.05	0.08	2.49	0.26	1.67	0.23	1.61	0.02	4.51
M-B-M-M versus	C	0.07	2.12	0.91	0.94	0.32	1.35	0.79	1.10	0.00	4.97	0.81	1.14
	FP	0.00	6.40	0.48	1.56	0.00	5.80	0.02	3.18	0.00	2.89	0.02	9.16
B-R-R versus	FP	0.01	3.94	0.63	0.76	0.17	2.33	0.30	1.91	0.21	1.80	0.49	2.03
	C	0.56	1.31	0.12	0.46	0.29	0.54	0.42	0.66	0.01	3.10	0.03	0.25
C versus	FP	0.00	3.02	0.14	1.66	0.00	4.31	0.05	2.90	0.19	0.58	0.03	8.02

¹Redundant parameter in the estimation algorithm (coded 0).
²Because of easier interpretation of odds >1 control was not set as a reference category in this table. Comparison of treatments can be conversed using the reciprocal value of Exp(β).