condition mean min max ZT0-3 0.883335 0.7757514999999999 0.9909185 ZT4-7 0.824284 0.824284 0.824284 ZT8-11 2.113015 2.113015 2.113015 ZT12-15 0 0 0 ZT16-19 1.52602 1.52602 1.52602 ZT20-23 0.85782 0.85782 0.85782