condition mean min max ZT0-3 1.3095599999999998 1.270875 1.348245 ZT4-7 2.29253 2.29253 2.29253 ZT8-11 4.255335 4.255335 4.255335 ZT12-15 0 0 0 ZT16-19 3.66904 3.66904 3.66904 ZT20-23 2.368455 2.368455 2.368455