condition mean min max ZT0-3 42.288273 42.288273 42.288273 ZT4-7 36.650236 36.650236 36.650236 ZT8-11 50.6390965 50.6390965 50.6390965 ZT12-15 46.6324355 46.6324355 46.6324355 ZT16-19 30.3280215 30.3280215 30.3280215 ZT20-23 21.3378065 21.3378065 21.3378065