condition mean min max ZT0-3 13.100000000000001 13.100000000000001 13.100000000000001 ZT4-7 18.2 18.2 18.2 ZT8-11 39.6 39.6 39.6 ZT12-15 53.45 53.45 53.45 ZT16-19 27.95 27.95 27.95 ZT20-23 29.6 29.6 29.6