condition mean min max ZT0-3 59.124025 52.12305 66.125 ZT4-7 31.9351 31.9351 31.9351 ZT8-11 19.7515 19.7515 19.7515 ZT12-15 0 0 0 ZT16-19 38.6291 38.6291 38.6291 ZT20-23 58.85175 58.85175 58.85175