condition mean min max ZT0-3 52.91635219 34.026125379999996 71.806579 ZT4-7 30.059385542500003 29.96108535 30.157685735 ZT8-11 30.830952265 29.124588355 32.537316175 ZT12-15 39.406939555 37.10437412 41.70950499 ZT16-19 39.9424766125 39.572177865 40.31277536 ZT20-23 39.364738487500006 38.016876980000006 40.712599995000005