condition mean min max ZT0-3 2.6245225000000003 2.56216 2.686885 ZT4-7 2.918015 2.918015 2.918015 ZT8-11 7.807055 7.807055 7.807055 ZT12-15 0 0 0 ZT16-19 6.07574 6.07574 6.07574 ZT20-23 4.2443349999999995 4.2443349999999995 4.2443349999999995