condition mean min max ZT0-3 2.6732674999999997 2.3256699999999997 3.0208649999999997 ZT4-7 3.4552249999999995 3.4552249999999995 3.4552249999999995 ZT8-11 4.632054999999999 4.632054999999999 4.632054999999999 ZT12-15 0 0 0 ZT16-19 5.02191 5.02191 5.02191 ZT20-23 3.0927049999999996 3.0927049999999996 3.0927049999999996