condition mean min max ZT0-3 0.34368350000000003 0.34368350000000003 0.34368350000000003 ZT4-7 0.42084 0.42084 0.42084 ZT8-11 0.27721300000000004 0.27721300000000004 0.27721300000000004 ZT12-15 0.21779099999999998 0.21779099999999998 0.21779099999999998 ZT16-19 0.4199085 0.4199085 0.4199085 ZT20-23 0.20799800000000002 0.20799800000000002 0.20799800000000002