condition mean min max ZT0-3 8.532123 8.532123 8.532123 ZT4-7 9.034396000000001 9.034396000000001 9.034396000000001 ZT8-11 8.406813 8.406813 8.406813 ZT12-15 8.066561 8.066561 8.066561 ZT16-19 8.0258955 8.0258955 8.0258955 ZT20-23 8.327352000000001 8.327352000000001 8.327352000000001