condition mean min max ZT0-3 0.4103061666666667 0.3846625 0.447064 ZT4-7 0.366223 0.366223 0.366223 ZT8-11 0.3998475 0.3998475 0.3998475 ZT12-15 0.32995224999999995 0.27797 0.38193449999999995 ZT16-19 0.2940215 0.2940215 0.2940215 ZT20-23 0.5535779999999999 0.5535779999999999 0.5535779999999999