condition mean min max ZT0-3 2.8085949027500003 2.7662558555000003 2.85093395 ZT4-7 6.28663970975 4.5510096644999996 8.022269755 ZT8-11 58.0748432825 29.113384215 87.03630235 ZT12-15 109.35826468249999 103.733297005 114.98323235999999 ZT16-19 67.65674521 49.494889295 85.818601125 ZT20-23 27.081470127499998 23.616741474999998 30.54619878