condition mean min max ZT0-3 62.349999999999994 62.349999999999994 62.349999999999994 ZT4-7 121.4 121.4 121.4 ZT8-11 141.95 141.95 141.95 ZT12-15 140.55 140.55 140.55 ZT16-19 118.60000000000001 118.60000000000001 118.60000000000001 ZT20-23 83.25 83.25 83.25