condition mean min max ZT0-3 26.6749 20.83545 32.5283 ZT4-7 22.0231 22.0231 22.0231 ZT8-11 7.353145 7.353145 7.353145 ZT12-15 10.3495725 8.045245 12.6539 ZT16-19 16.41085 16.41085 16.41085 ZT20-23 16.9832 16.9832 16.9832