condition mean min max ZT0-3 1.505175 1.073635 1.936715 ZT4-7 4.853555 4.853555 4.853555 ZT8-11 21.870150000000002 21.870150000000002 21.870150000000002 ZT12-15 0 0 0 ZT16-19 5.10167 5.10167 5.10167 ZT20-23 4.422675 4.422675 4.422675