condition mean min max ZT0-3 17.52145 17.2083 17.834600000000002 ZT4-7 12.9108 12.9108 12.9108 ZT8-11 9.601144999999999 9.601144999999999 9.601144999999999 ZT12-15 0 0 0 ZT16-19 13.4073 13.4073 13.4073 ZT20-23 17.086100000000002 17.086100000000002 17.086100000000002