condition mean min max ZT0-3 38.905325 38.905325 38.905325 ZT4-7 60.9234005 60.9234005 60.9234005 ZT8-11 43.722593 43.722593 43.722593 ZT12-15 42.452244 42.452244 42.452244 ZT16-19 39.4044825 39.4044825 39.4044825 ZT20-23 30.0322405 30.0322405 30.0322405