Table 2 Comparisons of participants with accommodation data recorded at 12 months (analysis data) and participants with lost data recorded at 12 months (missing data) at baseline and 6 months

From: Visual acuity, near phoria and accommodation in myopic children using spectacle lenses with aspherical lenslets: results from a randomized clinical trial

	Analysis data	Missing data	t-test, P value
Baseline
HAL group
N	37	17
Lag (D)	0.87 (0.29)	0.86 (0.35)	0.91
AMF (D)	0.21 (0.08)	0.19 (0.07)	0.42
SAL group
N	31	24
Lag (D)	0.94 (0.26)	0.95 (0.23)	0.93
AMF (D)	0.16 (0.05)	0.15 (0.06)	0.44
SVL group
N	31	21
Lag (D)	0.85 (0.27)	0.89 (0.33)	0.70
AMF (D)	0.15 (0.06)	0.17 (0.06)	0.51
6 months
HAL group
N	37	17
Lag (D)	0.76 (0.31)	0.79 (0.40)	0.73
AMF (D)	0.16 (0.07)	0.18 (0.05)	0.36
SAL group
N	31	24
Lag (D)	0.74 (0.27)	0.72 (0.26)	0.80
AMF (D)	0.15 (0.05)	0.12 (0.04)	0.02*
SVL group
N	31	21
Lag (D)	0.77 (0.21)	0.81 (0.21)	0.55
AMF (D)	0.11 (0.04)	0.14 (0.06)	0.08

HAL = spectacle lenses with highly aspherical lenslets; SAL = spectacle lenses with slightly aspherical lenslets; SVL = single-vision spectacle lenses; AMF = accommodative microfluctuation. *P < 0.05. Data are expressed as mean (SD)

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