condition mean min max ZT0-3 4.2826474999999995 3.650265 4.91503 ZT4-7 5.86267 5.86267 5.86267 ZT8-11 6.32319 6.32319 6.32319 ZT12-15 0 0 0 ZT16-19 7.694565 7.694565 7.694565 ZT20-23 6.608225 6.608225 6.608225