condition mean min max ZT0-3 5.0904576415000005 5.009816412 5.171098871 ZT4-7 3.53932822275 2.9489296485 4.129726797 ZT8-11 5.674687605999999 5.1329366085 6.216438603499999 ZT12-15 7.3210911127500005 6.486158954 8.1560232715 ZT16-19 5.56056362075 5.077570232999999 6.0435570085000005 ZT20-23 7.576463303000001 6.92870996 8.224216646