Table 2. Phenology of ATHB17 events and control.

Phase of Development	Event	Mean(days)	Control mean(days)	Delta(days)	% Delta	P-value	N
Planting to 50% silking	Event 1	58.4	58.5	−0.1	−0.2	0.299	110
	Event 2	58.4	58.5	−0.2	−0.3	0.067	110
Planting to 50% anthesis	Event 1	58.1	58.3	−0.2	−0.3	0.080	110
	Event 2	58.2	58.3	−0.1	−0.1	0.548	110
Anthesis silking interval	Event 1	0.26	0.25	0.02	6.1	0.865	111
	Event 2	0.09	0.25	−0.16	−63.9	0.075	111

Two independent ATHB17 events in three hybrids were used in physiological studies conducted in 2011 and 2012 under standard agricultural practices (SAP) for corn production in the Central Corn Belt. The number of days to 50% silking and anthesis were measured and the number of days between anthesis and silking was calculated (ASI) each year for physiological studies conducted under standard agronomic practices conditions. Differences in phenology between ATHB17 events and control were determined using an across year combined analysis using a mixed model ANOVA. N denotes the number of data points included per entry in the statistical analysis. Number of event data points were within ±3 of control data points. Results for individual hybrids per year are shown in Table S2.