condition mean min max ZT0-3 8.08573 8.08573 8.08573 ZT4-7 10.0932865 10.0932865 10.0932865 ZT8-11 10.6155995 10.6155995 10.6155995 ZT12-15 9.831680500000001 9.831680500000001 9.831680500000001 ZT16-19 8.695689999999999 8.695689999999999 8.695689999999999 ZT20-23 8.8599315 8.8599315 8.8599315