condition mean min max ZT0-3 189.793442 189.793442 189.793442 ZT4-7 186.382795 186.382795 186.382795 ZT8-11 170.125315 170.125315 170.125315 ZT12-15 174.54175800000002 174.54175800000002 174.54175800000002 ZT16-19 179.6749335 179.6749335 179.6749335 ZT20-23 164.5538645 164.5538645 164.5538645