Table 3.

Secondary outcomes

	n (DRIFT:standard)	DRIFT n (%) or mean (SD)	Standard n (%) or mean (SD)	Unadjusted difference (95% CI), p value	Adjusted difference* (95% CI), p value
Parent-reported visual function
Good vision	27:24	23 (85%)	17 (71%)	2.37 (0.60 to 9.40), 0.22†	3.73 (0.66 to 21.14), 0.14†
Questionnaire mean score	28:21	4.50 (0.70)	4.65 (0.38)	−0.15 (−0.49 to 0.19), 0.38‡	−0.12 (−0.47 to 0.24), 0.50‡
Sensorimotor disability
None		2 (7%)	3 (14%)
Moderate	27:21	2 (7%)	2 (10%)	0.55 (0.13 to 2.34), 0.42§	3.66 (0.33 to 40.34), 0.29§
Severe		23 (85%)	16 (76%)
Cerebral palsy
Diagnosed with cerebral palsy (%)	28:24	17 (61%)	14 (58%)	1.10 (0.36 to 3.35), 0.86†	0.37 (0.07 to 2.00), 0.25†
GMFCS level 1		7 (41%)	5 (36%)
GMFCS level 2		4 (24%)	3 (21%)
GMFCS level 3		2 (12%)	0 (0%)
GMFCS level 4		0 (0%)	2 (14%)
GMFCS level 5		4 (24%)	4 (29%)
Ambulant¶		11 (65%)	8 (57%)	1.38 (0.32 to 5.88), 0.67	1.32 (0.24 to 7.25), 0.75
Strengths and Difficulties Questionnaire
Total score	28:22	14.89 (8.48)	13.36 (6.59)	1.53 (−2.89 to 5.94), 0.49‡	2.01 (−2.78 to 6.81), 0.40‡

*Adjusted for age, sex, birth weight and grade of IVH.

†Logistic regression (OR).

‡Linear regression (difference in means).

§Ordinal logistic regression (OR per increase in category).

¶Children with cerebral palsy were categorised as ambulant (GMFCS level 1–2) or non-ambulant (GMFCS level 3–5).

DRIFT, drainage, irrigation and fibrinolytic therapy; GMFCS, Gross Motor Function Classification System; IVH, intraventricular haemorrhage.