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Table 1.

Comparison of mean student scores by target concept and implementation year.

Target concept	Curriculum Iteration^{^a}	n	Mean ± SD	Min.	Max.	t	df	P
Life cycle	Year 1	68	2.41 ± 0.77	1	5	1.164	125	0.247
Life cycle	Year 2	59	2.22 ± 1.04	1	5	1.164	125	0.247
Trait inheritance	Year 1	68	2.97 ± 1.01	1	7	5.109	125	0.000
Trait inheritance	Year 2	59	3.86 ± 0.96	0	5	5.109	125	0.000
Trait variation	Year 1	68	3.29 ± 0.95	1	6	6.427	125	0.000
Trait variation	Year 2	59	4.41 ± 1.00	1	6	6.427	125	0.000

Target concept	Curriculum Iteration^{^a}	n	Mean ± SD	Min.	Max.	t	df	P
Life cycle	Year 1	68	2.41 ± 0.77	1	5	1.164	125	0.247
Life cycle	Year 2	59	2.22 ± 1.04	1	5	1.164	125	0.247
Trait inheritance	Year 1	68	2.97 ± 1.01	1	7	5.109	125	0.000
Trait inheritance	Year 2	59	3.86 ± 0.96	0	5	5.109	125	0.000
Trait variation	Year 1	68	3.29 ± 0.95	1	6	6.427	125	0.000
Trait variation	Year 2	59	4.41 ± 1.00	1	6	6.427	125	0.000

Year 1: model-based curriculum; year 2: non-model-based curriculum.