condition mean min max ZT0-3 623.5999999999999 623.5999999999999 623.5999999999999 ZT4-7 659.8 659.8 659.8 ZT8-11 719.3 719.3 719.3 ZT12-15 670.75 670.75 670.75 ZT16-19 1079.5500000000002 1079.5500000000002 1079.5500000000002 ZT20-23 1056.65 1056.65 1056.65