condition mean min max ZT0-3 7.247192500000001 6.929605 7.564780000000001 ZT4-7 9.892859999999999 9.892859999999999 9.892859999999999 ZT8-11 11.576625 11.576625 11.576625 ZT12-15 0 0 0 ZT16-19 14.187650000000001 14.187650000000001 14.187650000000001 ZT20-23 9.719380000000001 9.719380000000001 9.719380000000001