condition mean min max ZT0-3 9.098794999999999 9.098794999999999 9.098794999999999 ZT4-7 5.84939 5.84939 5.84939 ZT8-11 7.939855 7.939855 7.939855 ZT12-15 10.50165 10.50165 10.50165 ZT16-19 10.9107 10.9107 10.9107 ZT20-23 9.582105 9.582105 9.582105