condition mean min max ZT0-3 17.900000000000002 17.900000000000002 17.900000000000002 ZT4-7 5.1 5.1 5.1 ZT8-11 17.4 17.4 17.4 ZT12-15 20.45 20.45 20.45 ZT16-19 16.799999999999997 16.799999999999997 16.799999999999997 ZT20-23 9.9 9.9 9.9