condition mean min max ZT0-3 94.224683 94.224683 94.224683 ZT4-7 30.0852405 30.0852405 30.0852405 ZT8-11 10.957693500000001 10.957693500000001 10.957693500000001 ZT12-15 11.7398405 11.7398405 11.7398405 ZT16-19 7.7204939999999995 7.7204939999999995 7.7204939999999995 ZT20-23 8.7055605 8.7055605 8.7055605