condition mean min max ZT0-3 16.91055 16.91055 16.91055 ZT4-7 13.7799 13.7799 13.7799 ZT8-11 15.0455 15.0455 15.0455 ZT12-15 15.622300000000001 15.622300000000001 15.622300000000001 ZT16-19 19.965400000000002 19.965400000000002 19.965400000000002 ZT20-23 16.643050000000002 16.643050000000002 16.643050000000002