condition mean min max ZT0-3 8.471775000000001 8.471775000000001 8.471775000000001 ZT4-7 6.587205 6.587205 6.587205 ZT8-11 7.80061 7.80061 7.80061 ZT12-15 8.681275 8.681275 8.681275 ZT16-19 10.464099999999998 10.464099999999998 10.464099999999998 ZT20-23 8.129470000000001 8.129470000000001 8.129470000000001