condition mean min max ZT0-3 7.99535 7.99535 7.99535 ZT4-7 5.422370000000001 5.422370000000001 5.422370000000001 ZT8-11 7.89501 7.89501 7.89501 ZT12-15 8.255265 8.255265 8.255265 ZT16-19 11.18125 11.18125 11.18125 ZT20-23 8.582899999999999 8.582899999999999 8.582899999999999