condition mean min max ZT0-3 1.225935 0.9469299999999999 1.4358 ZT4-7 0.6815424999999999 0.6815424999999999 0.6815424999999999 ZT8-11 0.666004 0.666004 0.666004 ZT12-15 2.4789874999999997 1.95879 2.9991849999999998 ZT16-19 2.0751049999999998 2.0751049999999998 2.0751049999999998 ZT20-23 2.01634 2.01634 2.01634