condition mean min max ZT0-3 9.3473275 9.00327 9.691385 ZT4-7 9.024785 9.024785 9.024785 ZT8-11 18.4306 18.4306 18.4306 ZT12-15 0 0 0 ZT16-19 19.6399 19.6399 19.6399 ZT20-23 12.931550000000001 12.931550000000001 12.931550000000001