condition mean min max ZT0-3 0.17134885 0.1144817 0.22821599999999997 ZT4-7 0.305233 0.305233 0.305233 ZT8-11 0.792487 0.792487 0.792487 ZT12-15 0 0 0 ZT16-19 0.5075115 0.5075115 0.5075115 ZT20-23 0.34424350000000004 0.34424350000000004 0.34424350000000004