condition mean min max ZT0-3 12.701670165000001 11.740066030000001 13.663274300000001 ZT4-7 9.8415686325 9.378735595 10.30440167 ZT8-11 11.338850268 9.298225436 13.3794751 ZT12-15 13.65001488925 12.89713528 14.4028944985 ZT16-19 11.98048441975 11.0839824645 12.876986375000001 ZT20-23 16.2776681675 15.745436044999998 16.80990029