condition mean min max ZT0-3 5.20469 5.20469 5.20469 ZT4-7 2.366365 2.366365 2.366365 ZT8-11 2.187605 2.187605 2.187605 ZT12-15 5.396675 5.396675 5.396675 ZT16-19 6.2710550000000005 6.2710550000000005 6.2710550000000005 ZT20-23 5.368065 5.368065 5.368065