condition mean min max ZT0-3 14.611962 14.611962 14.611962 ZT4-7 15.054042500000001 15.054042500000001 15.054042500000001 ZT8-11 13.0066865 13.0066865 13.0066865 ZT12-15 14.2404325 14.2404325 14.2404325 ZT16-19 11.578722500000001 11.578722500000001 11.578722500000001 ZT20-23 12.376476499999999 12.376476499999999 12.376476499999999