condition mean min max ZT0-3 7.2351875 6.52191 7.948465 ZT4-7 4.832065 4.832065 4.832065 ZT8-11 6.161935 6.161935 6.161935 ZT12-15 0 0 0 ZT16-19 8.36274 8.36274 8.36274 ZT20-23 7.084265 7.084265 7.084265