condition mean min max ZT0-3 47.056627 47.056627 47.056627 ZT4-7 18.128895 18.128895 18.128895 ZT8-11 24.938200000000002 24.938200000000002 24.938200000000002 ZT12-15 35.771432 35.771432 35.771432 ZT16-19 19.1183445 19.1183445 19.1183445 ZT20-23 18.555638000000002 18.555638000000002 18.555638000000002