condition mean min max ZT0-3 5.23687 4.30882 6.076555 ZT4-7 4.28561 4.28561 4.28561 ZT8-11 3.3586 3.3586 3.3586 ZT12-15 3.4979175 3.2501499999999997 3.745685 ZT16-19 3.8304400000000003 3.8304400000000003 3.8304400000000003 ZT20-23 5.72884 5.72884 5.72884