condition mean min max ZT0-3 3.80243 3.80243 3.80243 ZT4-7 0.776586 0.776586 0.776586 ZT8-11 4.942505 4.942505 4.942505 ZT12-15 14.629750000000001 14.629750000000001 14.629750000000001 ZT16-19 15.727049999999998 15.727049999999998 15.727049999999998 ZT20-23 8.515039999999999 8.515039999999999 8.515039999999999