condition mean min max ZT0-3 7.919387073499999 5.68031346 10.158460687 ZT4-7 13.129195715000002 11.909667755000001 14.348723675 ZT8-11 9.3656110605 9.075612431 9.655609689999999 ZT12-15 6.4506828655 5.721206407 7.180159324 ZT16-19 10.1109058025 8.055597604 12.166214001 ZT20-23 17.9608012925 14.483980115 21.43762247