condition mean min max ZT0-3 1.6384052682499999 1.2649839379999999 2.0118265985 ZT4-7 4.02277843975 2.6873696105 5.358187269 ZT8-11 6.6801267825 6.128670898 7.231582667 ZT12-15 9.49693326625 6.637515928500001 12.356350604 ZT16-19 10.634811307749999 9.4365210305 11.833101585 ZT20-23 5.4925508525 4.830246800499999 6.1548549045000005