Table 4.

Axial length and rate of axial length growth at a postmenstrual age of 40 weeks by subsets of various variables^a

Variable	Subsets	Intercept (95% CI)	Slope (95% CI)	p Valueb
Gestational age (weeks)	23–26	15.66 (15.39–15.93)	0.20 (0.18–0.23)	0.14
	27–28	16.37 (16.07–16.67)	0.25 (0.21–0.28)
	≥ 29	16.26 (15.95–16.56)	0.23 (0.18–0.28)
Birth weight (grams)	≤ 750	15.44 (15.17–15.71)	0.19 (0.16–0.22)	0.02 *
	> 750 to ≤ 1000	16.09 (15.80–16.39)	0.24 (0.20–0.28)
	> 1000 to ≤ 1250	16.34 (16.08–16.61)	0.23 (0.19–0.27)
	> 1250	16.97 (16.43–17.51)	0.28 (0.19–0.37)
Highest retinopathy of prematurity stage ever present	Stage 0	16.32 (16.04–16.61)	0.26 (0.23–0.30)	0.08
	Stage 1	16.04 (15.70–16.38)	0.20 (0.15–0.26)
	Stage 2	15.95 (15.73–16.16)	0.21 (0.17–0.25)
	≥ Stage 3	15.93 (15.57–16.30)	0.12 (− 0.04–0.28)
Sex	Male	16.15 (15.89–16.40)	0.24 (0.21–0.26)	0.14
	Female	15.99 (15.74–16.24)	0.21 (0.18–0.24)
Race	White	15.91 (15.68–16.15)	0.23 (0.21–0.26)	0.29
	Non-White	16.20 (15.95–16.45)	0.21 (0.18–0.24)
Multiparity	Singleton	16.07 (15.85–16.29)	0.22 (0.20–0.25)	0.70
	Multiple gestation	16.05 (15.75–16.35)	0.23 (0.20–0.26)
Central foveal thickness (μm)	≤ 0.156	16.30 (16.04–16.57)	0.26 (0.21–0.30)	0.26
	> 0.156–0.212	15.99 (15.67–16.31)	0.21 (0.17–0.26)
	> 0.212–0.312	15.99 (15.68–16.31)	0.23 (0.17–0.28)
	> 0.312	15.96 (15.72–16.20)	0.19 (0.14–0.25)
Subfoveal choroidal thickness (μm)	≤ 0.164	15.79 (15.47–16.12)	0.20 (0.16–0.25)	0.63
	> 0.164–0.216	15.90 (15.63–16.18)	0.21 (0.17–0.25)
	> 0.216–0.290	15.93 (15.70–16.16)	0.21 (0.16–0.26)
	> 0.290	16.24 (16.01–16.46)	0.19 (0.14–0.24)

CI confidence interval

^aEstimates from model included covariate of interest, postmenstrual age, and the interaction between them.

^bp Value comparing differences in rate of axial length growth across levels of each parameter, bolded values(*) denote statistical significance at p < 0.05.