condition mean min max ZT0-3 38.74250000000001 38.74250000000001 38.74250000000001 ZT4-7 31.11675 31.11675 31.11675 ZT8-11 32.03935 32.03935 32.03935 ZT12-15 35.25975 35.25975 35.25975 ZT16-19 38.5744 38.5744 38.5744 ZT20-23 36.488 36.488 36.488