condition mean min max ZT0-3 41.4 41.4 41.4 ZT4-7 93.4 93.4 93.4 ZT8-11 37.6 37.6 37.6 ZT12-15 79.9 79.9 79.9 ZT16-19 71.55000000000001 71.55000000000001 71.55000000000001 ZT20-23 111.4 111.4 111.4