condition mean min max ZT0-3 14.441925000000001 14.37095 14.5129 ZT4-7 8.017575 8.017575 8.017575 ZT8-11 5.004015 5.004015 5.004015 ZT12-15 0 0 0 ZT16-19 11.0981 11.0981 11.0981 ZT20-23 10.95645 10.95645 10.95645