condition mean min max ZT0-3 36.973974999999996 35.5854 38.36255 ZT4-7 21.45955 21.45955 21.45955 ZT8-11 31.86565 31.86565 31.86565 ZT12-15 0 0 0 ZT16-19 55.2967 55.2967 55.2967 ZT20-23 37.87465 37.87465 37.87465