Table:
period
men
women

hazard ratio
95% confidence interval
hazard ratio
95% confidence interval

from
to
from
to

1991- to-1996
1.50
1.38
1.62
2.08
1.90
2.27

1997-to-2001
1.65
1.53
1.77
2.01
1.85
2.18

2002-to-2006
1.71
1.60
1.83
2.18
2.03
2.34

How many rows and columns does this table contain? Output the final answer in the JSON format {"row_number": "m", "column_number": "n"}. For instance, if the table has 5 rows and 4 columns, the answer would be {"row_number": "5", "column_number": "4"}

There are 6 rows and 7 columns in the table. So, the final answer is {"row_number": "6", "column_number": "7"}.