condition mean min max ZT0-3 70.30000000000001 70.30000000000001 70.30000000000001 ZT4-7 11.1 11.1 11.1 ZT8-11 14.1 14.1 14.1 ZT12-15 16.6 16.6 16.6 ZT16-19 24.1 24.1 24.1 ZT20-23 57.449999999999996 57.449999999999996 57.449999999999996