condition mean min max ZT0-3 21.9058 21.8408 21.9708 ZT4-7 23.07175 23.07175 23.07175 ZT8-11 29.211 29.211 29.211 ZT12-15 0 0 0 ZT16-19 32.77105 32.77105 32.77105 ZT20-23 28.02355 28.02355 28.02355