Table 1.

Frequency of problem gambling among school pupils in southern Sweden based on data collected in 2016.

School grade and gender	Respondents (N)	Valid responses, n (%)	Problem gambling, n (%)	No problem gambling, n (%)
Boys in ninth grade of primary school	4609	4002 (86.8)	469 (11.7)	3533 (88.3)
Girls in ninth grade of primary school	4497	4167 (92.7)	48 (1.2)	4119 (98.8)
Boys in second grade of secondary school	3945	3407 (86.4)	472 (13.9)	2935 (86.1)
Girls in second grade of secondary school	3955	3634 (91.9)	27 (0.7)	3607 (99.3)