condition mean min max ZT0-3 2.22464 1.538645 2.9334949999999997 ZT4-7 1.3778299999999999 1.3778299999999999 1.3778299999999999 ZT8-11 2.84251 2.84251 2.84251 ZT12-15 3.878275 3.55305 4.2035 ZT16-19 3.99266 3.99266 3.99266 ZT20-23 5.121 5.121 5.121