condition mean min max ZT0-3 10.22385 10.22385 10.22385 ZT4-7 10.1187 10.1187 10.1187 ZT8-11 7.724305 7.724305 7.724305 ZT12-15 8.675355 8.675355 8.675355 ZT16-19 15.47605 15.47605 15.47605 ZT20-23 8.45205 8.45205 8.45205