condition mean min max ZT0-3 21.00115 19.64115 22.36115 ZT4-7 17.9148 17.9148 17.9148 ZT8-11 9.96337 9.96337 9.96337 ZT12-15 0 0 0 ZT16-19 16.7297 16.7297 16.7297 ZT20-23 19.48875 19.48875 19.48875