condition mean min max ZT0-3 123.320396 123.320396 123.320396 ZT4-7 73.209565 73.209565 73.209565 ZT8-11 81.2347185 81.2347185 81.2347185 ZT12-15 99.51916399999999 99.51916399999999 99.51916399999999 ZT16-19 179.675503 179.675503 179.675503 ZT20-23 196.97471050000001 196.97471050000001 196.97471050000001