condition mean min max ZT0-3 5.499332934 4.807363457 6.191302411 ZT4-7 2.6752359277499997 1.832687341 3.5177845144999997 ZT8-11 1.762116642 1.0677574225000002 2.4564758615 ZT12-15 4.54641437275 3.3800160415 5.712812704000001 ZT16-19 7.790014580999999 6.3228174164999995 9.2572117455 ZT20-23 14.158941749750001 10.176552109500001 18.14133139