condition mean min max ZT0-3 10.00833 9.29944 10.717220000000001 ZT4-7 19.6766 19.6766 19.6766 ZT8-11 15.20885 15.20885 15.20885 ZT12-15 0 0 0 ZT16-19 13.515600000000001 13.515600000000001 13.515600000000001 ZT20-23 11.68705 11.68705 11.68705