Table 3.

Neuropsychological test results related to number of dives and lifetime history of DCI. N = 50, 43 and 37 for the first, second and third part of the longitudinal follow-up^a

Test outcome	Exposure	Estimate	Lower	Upper	p value
Self-reported symptoms, Q16c, d	Number divesd	−0.02	−0.08	0.05	0.61
	Incident of DCI	0.16	0.02	0.29	0.02
Tests for intellectual ability
WAIS Informationb	Number divesd	−0.54	−0.98	−0.10	0.02
	Incident of DCI	0.26	−0.71	1.23	0.60
WAIS Block Designb	Number divesd	−0.66	−1.65	0.33	0.19
	Incident of DCI	0.26	−1.48	2.01	0.77
Tests for visuomotor processing speed
WAIS Digit Symbolb	Number divesd	0.49	−0.86	1.85	0.47
	Incident of DCI	1.57	−1.31	4.45	0.29
Trail Making Test Ac	Number divesd	−0.49	−2.19	1.21	0.57
	Incident of DCI	−0.70	−4.30	2.90	0.70
Trail Making Test Bc, d	Number divesd	0.00	−0.03	0.04	0.84
	Incident of DCI	−0.07	−0.14	0.01	0.07
Attention span/working/visual memory
WAIS Digit Span—forwardb	Number divesd	0.00	−0.23	0.23	0.99
	Incident of DCI	−0.01	−0.50	0.49	0.98
WAIS Digit Span—backwardb	Number divesd	0.03	−0.25	0.31	0.84
	Incident of DCI	−0.44	−1.03	0.14	0.13
Benton Visual Retention Test Correctb	Number divesd	−0.07	−0.33	0.19	0.59
	Incident of DCI	−0.71	−1.23	−0.18	0.008
Benton Visual Retention Test Errorsc	Number divesd	0.20	−0.16	0.55	0.28
	Incident of DCI	1.29	0.58	2.00	0.0003
Motor speed/manual dexterity
Pegboard dom handc	Number divesd	−1.40	−2.83	0.03	0.06
	Incident of DCI	−2.27	−5.32	0.79	0.15
Pegboard non-dom handc d	Number divesd	−0.01	−0.02	0.01	0.40
	Incident of DCI	−0.01	−0.04	0.01	0.35
Tests for reaction time (NES2)
Simple Reaction Time (SRT)c d	Number divesd	0.00	−0.01	0.00	0.60
	Incident of DCI	−0.01	−0.03	0.00	0.04
Continuous Performance Test (CPT)c d	Number divesd	−0.01	−0.01	0.00	0.16
	Incident of DCI	−0.01	−0.03	0.01	0.20

^aLinear mixed model. For the Q 16, adjustments were only made for age. All other variables were in addition to age-adjustment, either adjusted for years of education or for reading difficulties (Trail Making Test A and B and NES CPT). In addition, the Digit Span Forwards, the Pegboard test and the Trail Making Test A were corrected for use of nicotine consumption

^bA higher value is a better score

^cA lower value is a better score

^dLog transformed (log₁₀)