condition mean min max ZT0-3 3.0662838333333333 1.3651565 4.522695000000001 ZT4-7 0.8016604999999999 0.8016604999999999 0.8016604999999999 ZT8-11 1.921745 1.921745 1.921745 ZT12-15 2.988605 2.8917650000000004 3.085445 ZT16-19 4.66204 4.66204 4.66204 ZT20-23 3.228565 3.228565 3.228565