Table 4. Mixed model analysis of variance and means of field history metrics of focal fields and surrounding fields from the past six years of management.

Field History Metric a	Focal Fields b	Surr. Fields b	DF	F	P
Years cont. corn c	5.05 ± 0.99 (20)	4.87 ± 0.65 (46)	1, 45	0.30	0.59
Proportion corn d	0.83 ± 0.03 (20)	0.78 ± 0.03 (46)	1, 36	1.79	0.19
Proportion S.I. use e	0.26 ± 0.07 (18)	0.22 ± 0.06 (37)	1, 35	0.83	0.37
Proportion non-Bt f	0.09 ± 0.03 (15)	0.25 ± 0.05 (34)	1, 31	4.50	0.04
Proportion Cry3Bb1 or mCry3A g	0.29 ± 0.07 (14)	0.11 ± 0.04 (33)	1, 30	9.58	0.004
Proportion Cry34/35Ab1 h	0.01 ± 0.01 (14)	0.02 ± 0.01 (33)	1, 30	0.88	0.36
Proportion Cry34/35Ab1 + Cry3 i	0.61 ± 0.08 (14)	0.62 ± 0.07 (33)	1, 30	0.02	0.90
Proportion S.I. on Bt j	0.24 ± 0.08 (16)	0.20 ± 0.06 (34)	1, 32	1.05	0.31
Proportion S.I. on non-Bt k	0.01 ± 0.01 (17)	0.03 ± 0.02 (37)	1, 35	0.58	0.45

^a Field history metrics are proportions of years taken from the most recent 6 years. S.I. indicates soil insecticide.

^b Mean ± SE (N).

^c Random factor: Location χ² = 2.3, DF = 1, P = 0.06.

^d Random factor: Location χ² = 0.0, DF = 1, P = 0.00; Location × Field type χ² = 1.9, DF = 1, P = 0.08.

^e Random factor: Location χ² = 7.4, DF = 1, P = 0.003.

^f Random factor: Location χ² = 3.1, DF = 1, P = 0.04.

^g Random factor: Location χ² = 6.7, DF = 1, P = 0.005.

^h Random factor: Location χ² = 9.5, DF = 1, P = 0.002.

ⁱ Random factor: Location χ² = 6.5, DF = 1, P = 0.005.

^j Random factor: Location χ² = 7.0, DF = 1, P = 0.004.

^k Random factor: Location χ² = 1.3, DF = 1, P = 0.13.