condition mean min max ZT0-3 11.99771 3.7234800000000003 16.38355 ZT4-7 3.43081 3.43081 3.43081 ZT8-11 1.053241 1.053241 1.053241 ZT12-15 5.9088025 4.5023 7.315305 ZT16-19 7.285265 7.285265 7.285265 ZT20-23 11.04859 11.04859 11.04859