condition mean min max ZT0-3 25.242698 25.242698 25.242698 ZT4-7 15.77338 15.77338 15.77338 ZT8-11 13.403286000000001 13.403286000000001 13.403286000000001 ZT12-15 13.058832500000001 13.058832500000001 13.058832500000001 ZT16-19 14.193318 14.193318 14.193318 ZT20-23 11.511426 11.511426 11.511426