condition mean min max ZT0-3 5.0006 4.592105 5.409095000000001 ZT4-7 5.131765 5.131765 5.131765 ZT8-11 5.557455 5.557455 5.557455 ZT12-15 0 0 0 ZT16-19 6.68224 6.68224 6.68224 ZT20-23 4.73182 4.73182 4.73182