condition mean min max ZT0-3 8.620442500000001 8.575040000000001 8.665845000000001 ZT4-7 6.577640000000001 6.577640000000001 6.577640000000001 ZT8-11 4.148680000000001 4.148680000000001 4.148680000000001 ZT12-15 0 0 0 ZT16-19 5.70916 5.70916 5.70916 ZT20-23 6.78118 6.78118 6.78118