condition mean min max ZT0-3 11.450000000000001 11.450000000000001 11.450000000000001 ZT4-7 1.7 1.7 1.7 ZT8-11 26.549999999999997 26.549999999999997 26.549999999999997 ZT12-15 13.4 13.4 13.4 ZT16-19 17.450000000000003 17.450000000000003 17.450000000000003 ZT20-23 11.049999999999999 11.049999999999999 11.049999999999999