condition mean min max ZT0-3 13.6762 13.0686 14.2838 ZT4-7 10.62475 10.62475 10.62475 ZT8-11 15.8849 15.8849 15.8849 ZT12-15 0 0 0 ZT16-19 16.391849999999998 16.391849999999998 16.391849999999998 ZT20-23 16.521349999999998 16.521349999999998 16.521349999999998