condition mean min max ZT0-3 8.157755 7.43678 8.878730000000001 ZT4-7 10.8566 10.8566 10.8566 ZT8-11 43.64505 43.64505 43.64505 ZT12-15 0 0 0 ZT16-19 11.92375 11.92375 11.92375 ZT20-23 12.43755 12.43755 12.43755