condition mean min max ZT0-3 1.4179529425 0.0 2.835905885 ZT4-7 6.21661904675 5.3436976405 7.089540453 ZT8-11 6.4368362032499995 6.1544138015 6.719258605 ZT12-15 38.4368516255 26.794792136 50.078911115 ZT16-19 74.8484985225 68.38471787 81.312279175 ZT20-23 97.62180269 90.072595735 105.171009645