condition mean min max ZT0-3 91.739245 91.739245 91.739245 ZT4-7 52.5328045 52.5328045 52.5328045 ZT8-11 59.665285999999995 59.665285999999995 59.665285999999995 ZT12-15 62.729296500000004 62.729296500000004 62.729296500000004 ZT16-19 77.56271000000001 77.56271000000001 77.56271000000001 ZT20-23 80.687501 80.687501 80.687501