TABLE 1.

Characteristics of the study sample of 5162 men in relation to ever cannabis use.

	Have used cannabis
Variables	No	Yes	Total	p value a
n (%)	3134 (60.7)	2028 (39.3)	5162
IQ (mean [SD])
Conscription	99.51 [15.19]	100.77 [14.67]	100.00 [15.00]	0.003
Follow‐up	92.68 [14.95]	95.48 [13.77]	93.78 [14.56]	< 0.001
IQ change	−6.82 [9.54]	−5.29 [9.88]	−6.22 [9.70]	< 0.001
Age at examination, years (mean [SD])
Conscription	20.03 [2.08]	20.25 [2.20]	20.12 [2.13]	< 0.001
Follow‐up	64.50 [4.03]	63.54 [4.03]	64.12 [4.06]	< 0.001
Retest interval length	44.47 [4.37]	43.30 [4.15]	44.01 [4.32]	< 0.001
Years of education (mean [SD])	12.49 [4.47]	12.99 [4.10]	12.69 [4.34]	< 0.001
Smoking				< 0.001
Never (n (%))	1444 (46.1)	273 (13.5)	1717 (33.3)
Former (n (%))	1317 (42.0)	1327 (65.4)	2644 (51.2)
Current (n (%))	373 (11.9)	428 (21.1)	801 (15.5)
Years of weekly extreme binge drinking (mean [SD]) b	3.34 [9.34]	6.95 [12.97]	4.76 [11.05]	< 0.001
Use of other illicit drugs				< 0.001
Yes (n (%))	21 (0.7)	564 (27.8)	585 (11.3)
No (n (%))	3113 (99.3)	1463 (72.2)	4576 (88.7)
Charlson Comorbidity Index score (mean [SD])	0.87 [1.55]	0.82 [1.54]	0.85 [1.55]	0.279
Psychiatric disorders				< 0.001
Yes (n (%))	518 (16.5)	556 (27.4)	1074 (20.8)
No (n (%))	2616 (83.5)	1472 (72.6)	4088 (79.2)

^a Analyzed using Welch's t‐test.

^b Years of weekly extreme binge drinking (≥ 10 units on the same occasion) from the age of 15 to follow‐up.