condition mean min max ZT0-3 11.405275 11.405275 11.405275 ZT4-7 14.2715575 14.2715575 14.2715575 ZT8-11 14.0931005 14.0931005 14.0931005 ZT12-15 14.2999855 14.2999855 14.2999855 ZT16-19 13.966935 13.966935 13.966935 ZT20-23 11.982715500000001 11.982715500000001 11.982715500000001