condition mean min max ZT0-3 163.770518 163.770518 163.770518 ZT4-7 132.5360195 132.5360195 132.5360195 ZT8-11 124.8185475 124.8185475 124.8185475 ZT12-15 147.124097 147.124097 147.124097 ZT16-19 162.320796 162.320796 162.320796 ZT20-23 196.838761 196.838761 196.838761