condition mean min max ZT0-3 25.202771455 21.27446471 29.1310782 ZT4-7 13.91932293 11.92274255 15.915903310000001 ZT8-11 15.509317602500001 15.38913758 15.629497625 ZT12-15 8.518085378 7.5891653505 9.4470054055 ZT16-19 11.224471280749999 8.3607582465 14.088184315 ZT20-23 31.284343640000003 25.323780945 37.244906335