condition mean min max ZT0-3 19.963124999999998 16.97225 22.954 ZT4-7 8.815760000000001 8.815760000000001 8.815760000000001 ZT8-11 6.387734999999999 6.387734999999999 6.387734999999999 ZT12-15 0 0 0 ZT16-19 14.3503 14.3503 14.3503 ZT20-23 19.3674 19.3674 19.3674