condition mean min max ZT0-3 24.7581 24.7581 24.7581 ZT4-7 19.1767 19.1767 19.1767 ZT8-11 16.684 16.684 16.684 ZT12-15 18.460099999999997 18.460099999999997 18.460099999999997 ZT16-19 26.305300000000003 26.305300000000003 26.305300000000003 ZT20-23 26.8275 26.8275 26.8275