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

What are the cells' values in these rows of the table? The cells in a row should be presented in the JSON format of {"row_id":"<row index>", "cell_list":"<a list of cells in this row>"}, e.g., {"row_id":"3", "cell_list": ["xxx", "yyy", "zzz"]}.
the 19th row
the 15th row
the 18th row
the 14th row
the 1st row

The cell values of target rows are as follows:
For the 19th row: {"row_id": "19", "cell_list": ['once or twice', '2.6', '1.5', '3.7']}
For the 15th row: {"row_id": "15", "cell_list": ['frequency of use', '', '', '']}
For the 18th row: {"row_id": "18", "cell_list": ['monthly', '8.3', '3.7', '12.8']}
For the 14th row: {"row_id": "14", "cell_list": ['dried (flower/leaf) other', '33.7', '26.5', '41.0']}
For the 1st row: {"row_id": "1", "cell_list": ['', 'quantities of dried cannabis', '', '']}