condition mean min max ZT0-3 42.4597 42.4597 42.4597 ZT4-7 37.4287 37.4287 37.4287 ZT8-11 33.6058 33.6058 33.6058 ZT12-15 31.53835 31.53835 31.53835 ZT16-19 37.893150000000006 37.893150000000006 37.893150000000006 ZT20-23 42.5972 42.5972 42.5972