condition mean min max ZT0-3 38.217875 37.18615 39.2496 ZT4-7 43.476150000000004 43.476150000000004 43.476150000000004 ZT8-11 43.4293 43.4293 43.4293 ZT12-15 0 0 0 ZT16-19 53.308 53.308 53.308 ZT20-23 42.8153 42.8153 42.8153