Table 1.

Demographic information of recruited subjects

	N	Sex (M/F)	Age	AtCoder rate	PE (year)	JE (year)	CPE (year)
Expert	10	10 / 0	22.6 ± 1.1	1969 ± 467	6.9 ± 2.8	2.8 ± 2.4	4.1 ± 2.6
Middle	10	9 / 1	22.5 ± 0.8	894 ± 175	4.8 ± 1.7	1.1 ± 0.8	1.3 ± 0.8
Novice	10	9 / 1	21.7 ± 1.2	NA	2.8 ± 0.6	1.4 ± 1.0	NA

Numerics from fourth (age) to last columns denote mean ± SD. PE, programming experience; JE, JAVA experience; CPE, competitive programming experience. Significant differences were observed between PE of expert-novice, middle-novice; CPE of expert-middle (two-sample t test, p < 0.05 FDR-corrected).