condition mean min max ZT0-3 844.75 844.75 844.75 ZT4-7 461.6 461.6 461.6 ZT8-11 685.15 685.15 685.15 ZT12-15 786.7 786.7 786.7 ZT16-19 903.4000000000001 903.4000000000001 903.4000000000001 ZT20-23 1119.8 1119.8 1119.8