condition mean min max ZT0-3 11.706425 11.273299999999999 12.13955 ZT4-7 10.8127 10.8127 10.8127 ZT8-11 11.645050000000001 11.645050000000001 11.645050000000001 ZT12-15 0 0 0 ZT16-19 15.761949999999999 15.761949999999999 15.761949999999999 ZT20-23 12.19535 12.19535 12.19535