condition mean min max ZT0-3 1.057667 1.0156915 1.0996425 ZT4-7 0.961067 0.961067 0.961067 ZT8-11 0.5320725 0.5320725 0.5320725 ZT12-15 0 0 0 ZT16-19 1.917315 1.917315 1.917315 ZT20-23 1.823435 1.823435 1.823435