condition mean min max ZT0-3 15.6848146475 11.85707309 19.512556205 ZT4-7 12.69940121025 11.834539605 13.564262815500001 ZT8-11 10.34460381475 10.338627067000001 10.3505805625 ZT12-15 9.229031323249998 8.812541012499999 9.645521634 ZT16-19 9.469479259749999 7.8506274895 11.088331029999999 ZT20-23 15.419856405 15.14274607 15.69696674