condition mean min max ZT0-3 42.288273 42.288273 42.288273 ZT4-7 20.6780345 20.6780345 20.6780345 ZT8-11 23.445967 23.445967 23.445967 ZT12-15 22.543681499999998 22.543681499999998 22.543681499999998 ZT16-19 34.0579505 34.0579505 34.0579505 ZT20-23 40.9605235 40.9605235 40.9605235