condition mean min max ZT0-3 0.33903216666666663 0.232197 0.41086049999999996 ZT4-7 0.30279900000000004 0.30279900000000004 0.30279900000000004 ZT8-11 0.356198 0.356198 0.356198 ZT12-15 0.8393109999999999 0.6927095 0.9859125 ZT16-19 0.8450625 0.8450625 0.8450625 ZT20-23 0.7145630000000001 0.7145630000000001 0.7145630000000001