condition mean min max ZT0-3 10.163417 10.163417 10.163417 ZT4-7 11.139216000000001 11.139216000000001 11.139216000000001 ZT8-11 10.709685 10.709685 10.709685 ZT12-15 10.9776415 10.9776415 10.9776415 ZT16-19 12.868096999999999 12.868096999999999 12.868096999999999 ZT20-23 11.457231499999999 11.457231499999999 11.457231499999999