condition mean min max ZT0-3 14.71195 14.70205 14.72185 ZT4-7 12.7522 12.7522 12.7522 ZT8-11 22.00805 22.00805 22.00805 ZT12-15 0 0 0 ZT16-19 22.5322 22.5322 22.5322 ZT20-23 20.2335 20.2335 20.2335