condition mean min max ZT0-3 5.6466525 4.36925 6.924054999999999 ZT4-7 8.18143 8.18143 8.18143 ZT8-11 10.395945000000001 10.395945000000001 10.395945000000001 ZT12-15 0 0 0 ZT16-19 10.09769 10.09769 10.09769 ZT20-23 10.976659999999999 10.976659999999999 10.976659999999999