condition mean min max ZT0-3 16.793083333333332 11.5485 21.541 ZT4-7 11.118590000000001 11.118590000000001 11.118590000000001 ZT8-11 11.402685 11.402685 11.402685 ZT12-15 15.14555 14.6955 15.595600000000001 ZT16-19 15.240649999999999 15.240649999999999 15.240649999999999 ZT20-23 19.129199999999997 19.129199999999997 19.129199999999997