condition mean min max ZT0-3 1.9242475 1.801485 2.04701 ZT4-7 1.488125 1.488125 1.488125 ZT8-11 1.92431 1.92431 1.92431 ZT12-15 0 0 0 ZT16-19 2.2434250000000002 2.2434250000000002 2.2434250000000002 ZT20-23 2.32231 2.32231 2.32231