condition mean min max ZT0-3 18.974282 18.974282 18.974282 ZT4-7 15.413058499999998 15.413058499999998 15.413058499999998 ZT8-11 14.02481 14.02481 14.02481 ZT12-15 15.183871 15.183871 15.183871 ZT16-19 13.486196 13.486196 13.486196 ZT20-23 15.700699 15.700699 15.700699