condition mean min max ZT0-3 9.21761 9.21761 9.21761 ZT4-7 11.672049999999999 11.672049999999999 11.672049999999999 ZT8-11 7.929245 7.929245 7.929245 ZT12-15 6.42075 6.42075 6.42075 ZT16-19 6.7580849999999995 6.7580849999999995 6.7580849999999995 ZT20-23 6.419544999999999 6.419544999999999 6.419544999999999