condition mean min max ZT0-3 2.2897175 1.92309 2.656345 ZT4-7 2.556845 2.556845 2.556845 ZT8-11 4.62229 4.62229 4.62229 ZT12-15 0 0 0 ZT16-19 4.846725 4.846725 4.846725 ZT20-23 4.4152000000000005 4.4152000000000005 4.4152000000000005