condition mean min max ZT0-3 56.53773 18.25429 84.97445 ZT4-7 8.82772 8.82772 8.82772 ZT8-11 17.305235 17.305235 17.305235 ZT12-15 37.179275000000004 32.7869 41.571650000000005 ZT16-19 59.8416 59.8416 59.8416 ZT20-23 78.0202 78.0202 78.0202