condition mean min max ZT0-3 1.8515249999999999 1.39202 2.3110299999999997 ZT4-7 2.01095 2.01095 2.01095 ZT8-11 1.4329 1.4329 1.4329 ZT12-15 0 0 0 ZT16-19 3.168705 3.168705 3.168705 ZT20-23 2.206995 2.206995 2.206995