condition mean min max ZT0-3 7.19055 7.19055 7.19055 ZT4-7 5.63985 5.63985 5.63985 ZT8-11 8.00023 8.00023 8.00023 ZT12-15 9.241735 9.241735 9.241735 ZT16-19 9.856195 9.856195 9.856195 ZT20-23 6.988645 6.988645 6.988645