condition mean min max ZT0-3 28.48575 28.48575 28.48575 ZT4-7 36.13745 36.13745 36.13745 ZT8-11 26.72465 26.72465 26.72465 ZT12-15 22.91425 22.91425 22.91425 ZT16-19 26.0375 26.0375 26.0375 ZT20-23 27.742350000000002 27.742350000000002 27.742350000000002