condition mean min max ZT0-3 9.469246 9.469246 9.469246 ZT4-7 9.6969095 9.6969095 9.6969095 ZT8-11 10.495257500000001 10.495257500000001 10.495257500000001 ZT12-15 11.746678 11.746678 11.746678 ZT16-19 10.011322 10.011322 10.011322 ZT20-23 9.4654335 9.4654335 9.4654335