Table 2

Outcome by endpoint

Assessment	Valve		Risk difference (95% CI)	OR (95% CI)*	p Value
Assessment	Programmable	Gravitational	Risk difference (95% CI)	OR (95% CI)*	p Value
Hospital stay (t1)
Participants	71	74
Subdural effusion	10	1	−13% (−21% to −4%)	0.08 (0.01 to 0.67)	0.020
Bleeding complications	4	1	−4% (−10% to 2%)	0.23 (0.03 to 2.10)	0.193
Misplacement	6	4	−3% (−11% to 5%)	0.62 (0.17 to 2.29)	0.473
Follow-up at 6 months (t2)
Participants	67	70
Subdural effusion	24	4	−30% (−43% to −17%)	0.11 (0.04 to 0.33)	< 0.001
Overdrainage	26	4	−33% (−46% to −20%)	0.10 (0.03 to 0.29)	< 0.001
Cumulative incidence of overdrainage	29	5	−36% (−49% to −23%)	0.10 (0.04 to 0.28)	< 0.001
Underdrainage	3	2	−2% (−8% to 5%)	0.62 (0.10 to 3.82)	0.604
Follow-up at 12 months (t3)
Participants	58	60
Subdural effusion	12	0	−21% (−31% to −10%)	–
Overdrainage	14	2	−21% (−33% to −9%)	0.10 (0.02 to 0.46)	0.003
Cumulative incidence of overdrainage	34	7	−44% (−59% to −30%)	0.10 (0.04 to 0·24)	<0.001
Underdrainage	8	1	−12% (−21% to −3%)	0.00 (0.01 to 0.84)	0.033
Cumulative incidence of adverse events
Wound infection	1	2	1% (−3% to 6%)	1.94 (0.17 to 21.93)	0.591
Local bleeding	4	1	−4% (−10% to 2%)	0.23 (0.03 to 2.10)	0.193
Malplacement	6	4	−3% (−11% to 5%)	0.62 (0.17 to 2.29)	0.473
Device exchange	3	1	−3% (−8% to 2%)	0.31 (0.03 to 3.06)	0.316
Pressure adjustment	29	28	−3% (−19% to 13%)	0.88 (0.45 to 1.72)	0.711
Death	0	2	3% (−1% to 6%)	–