condition mean min max ZT0-3 3.5999999999999996 3.5999999999999996 3.5999999999999996 ZT4-7 16.8 16.8 16.8 ZT8-11 4.2 4.2 4.2 ZT12-15 8.7 8.7 8.7 ZT16-19 14.1 14.1 14.1 ZT20-23 7.300000000000001 7.300000000000001 7.300000000000001