condition mean min max ZT0-3 3.6050535 1.3695869999999999 5.84052 ZT4-7 3.192165 3.192165 3.192165 ZT8-11 3.2100600000000004 3.2100600000000004 3.2100600000000004 ZT12-15 0 0 0 ZT16-19 2.24273 2.24273 2.24273 ZT20-23 7.2006 7.2006 7.2006