condition mean min max ZT0-3 40.936704 40.936704 40.936704 ZT4-7 32.2461585 32.2461585 32.2461585 ZT8-11 45.162240999999995 45.162240999999995 45.162240999999995 ZT12-15 55.8899855 55.8899855 55.8899855 ZT16-19 60.829207 60.829207 60.829207 ZT20-23 37.47583 37.47583 37.47583