condition mean min max ZT0-3 1.11586175 0.7809185000000001 1.450805 ZT4-7 1.312151 1.312151 1.312151 ZT8-11 0.6593325 0.6593325 0.6593325 ZT12-15 0 0 0 ZT16-19 2.855165 2.855165 2.855165 ZT20-23 2.476575 2.476575 2.476575