condition mean min max ZT0-3 0.5641433217499999 0.425892028 0.7023946154999999 ZT4-7 1.902004586 1.7024655935 2.1015435785000003 ZT8-11 2.1574727935 2.0312735385 2.2836720485 ZT12-15 4.37245309175 3.2533811265 5.4915250570000005 ZT16-19 7.27256613575 6.441320157 8.1038121145 ZT20-23 9.61859511275 9.4205743785 9.816615847000001