condition mean min max ZT0-3 10.45156 8.52139 12.4497 ZT4-7 10.226115 10.226115 10.226115 ZT8-11 6.79279 6.79279 6.79279 ZT12-15 7.0407025 6.76501 7.316395 ZT16-19 6.531625 6.531625 6.531625 ZT20-23 8.088245 8.088245 8.088245