condition mean min max ZT0-3 0.6079015000000001 0.5560095 0.6597935 ZT4-7 1.0367315 1.0367315 1.0367315 ZT8-11 0.857259 0.857259 0.857259 ZT12-15 0 0 0 ZT16-19 0.5555950000000001 0.5555950000000001 0.5555950000000001 ZT20-23 0.372508 0.372508 0.372508