condition mean min max ZT0-3 30.018375 27.3338 32.70295 ZT4-7 29.09665 29.09665 29.09665 ZT8-11 37.72725 37.72725 37.72725 ZT12-15 0 0 0 ZT16-19 52.5322 52.5322 52.5322 ZT20-23 37.73755 37.73755 37.73755