condition mean min max ZT0-3 27.150000000000002 27.150000000000002 27.150000000000002 ZT4-7 13.7 13.7 13.7 ZT8-11 48.45 48.45 48.45 ZT12-15 53.75 53.75 53.75 ZT16-19 39.05 39.05 39.05 ZT20-23 13.7 13.7 13.7