condition mean min max ZT0-3 11.05905 10.5084 11.6097 ZT4-7 9.29253 9.29253 9.29253 ZT8-11 7.837724999999999 7.837724999999999 7.837724999999999 ZT12-15 0 0 0 ZT16-19 12.1562 12.1562 12.1562 ZT20-23 11.55595 11.55595 11.55595