Table:
quantities of dried cannabis

mean
95% confidence interval

lower limit
upper limit

total grams

average
27.5
22.7
32.3

gender

males
27.6
21.3
33.9

females
27.6
20.6
34.6

age group

15 to 24
18.9
10.7
27.0

25 or older
30.0
24.5
35.6

cannabis product type

dried (flower/leaf) only
22.1
15.9
28.4

dried (flower/leaf) other
33.7
26.5
41.0

frequency of use

daily or almost daily
62.6
52.3
72.9

weekly
12.0
8.9
15.1

monthly
8.3
3.7
12.8

once or twice
2.6
1.5
3.7

I'd like to know the total number of rows and columns in the provided table. Show your final answer in the JSON format {"row_number": "m", "column_number": "n"}.

This table has 19 rows and 4 columns. Thus, the final answer is {"row_number": "19", "column_number": "4"}.