condition mean min max ZT0-3 65.895095 65.895095 65.895095 ZT4-7 50.175617 50.175617 50.175617 ZT8-11 66.2661125 66.2661125 66.2661125 ZT12-15 56.615814 56.615814 56.615814 ZT16-19 70.4792405 70.4792405 70.4792405 ZT20-23 61.2555165 61.2555165 61.2555165