condition mean min max ZT0-3 48.2679875475 45.57803195 50.957943145 ZT4-7 63.98968157333333 59.47327962 68.50608352666666 ZT8-11 61.58925683166667 59.02095970333333 64.15755396 ZT12-15 67.23316807166667 65.00387874 69.46245740333333 ZT16-19 70.872775775 70.65101098 71.09454056999999 ZT20-23 63.002755191666665 57.63528818 68.37022220333333