condition mean min max ZT0-3 12.11496 12.11496 12.11496 ZT4-7 12.962784 12.962784 12.962784 ZT8-11 12.283518 12.283518 12.283518 ZT12-15 12.239747000000001 12.239747000000001 12.239747000000001 ZT16-19 12.2281575 12.2281575 12.2281575 ZT20-23 15.3709935 15.3709935 15.3709935