condition mean min max ZT0-3 7.699999999999999 7.699999999999999 7.699999999999999 ZT4-7 4.1 4.1 4.1 ZT8-11 24.150000000000002 24.150000000000002 24.150000000000002 ZT12-15 27.4 27.4 27.4 ZT16-19 34.1 34.1 34.1 ZT20-23 6.800000000000001 6.800000000000001 6.800000000000001