condition mean min max ZT0-3 1.3918019999999998 1.382315 1.4012889999999998 ZT4-7 1.057887 1.057887 1.057887 ZT8-11 1.3945100000000001 1.3945100000000001 1.3945100000000001 ZT12-15 0 0 0 ZT16-19 2.413356 2.413356 2.413356 ZT20-23 3.45724 3.45724 3.45724