condition mean min max ZT0-3 158.895643555 119.72854360999999 198.0627435 ZT4-7 37.19499902 29.60272029 44.78727775 ZT8-11 13.771871769 11.693384890499999 15.8503586475 ZT12-15 15.663516937499999 12.37085641 18.956177465 ZT16-19 38.885690032499994 31.210342945 46.561037119999995 ZT20-23 77.82524455999999 64.40225739 91.24823172999999