condition mean min max ZT0-3 12.464812 12.464812 12.464812 ZT4-7 11.777575500000001 11.777575500000001 11.777575500000001 ZT8-11 13.171756 13.171756 13.171756 ZT12-15 13.044026500000001 13.044026500000001 13.044026500000001 ZT16-19 13.467900499999999 13.467900499999999 13.467900499999999 ZT20-23 13.92067 13.92067 13.92067