condition mean min max ZT0-3 13.796328 13.796328 13.796328 ZT4-7 12.125461000000001 12.125461000000001 12.125461000000001 ZT8-11 13.406153 13.406153 13.406153 ZT12-15 10.926647500000001 10.926647500000001 10.926647500000001 ZT16-19 12.511762999999998 12.511762999999998 12.511762999999998 ZT20-23 12.973336 12.973336 12.973336