The biometric parameters of aniso-astigmatism and its risk factor in Chinese preschool children: the Nanjing eye study

Table 1 Prevalence of aniso- total astigmatism stratified by sex and age

Characteristics	N (%)	Vectorial aniso-TA ^a N (%, 95 CI)	P	Non-vectorial aniso-TA ^b N (%, 95 CI)	P
Sex			0.77		0.74
Boys	603 (53.3%)	22 (3.65%, 2.15–5.15)		13 (2.16%, 0.99–3.32)
Girls	528 (46.7%)	22 (4.17%, 2.46–5.88)		9 (1.70%, 0.60–2.81)
Age (month)			0.82		0.71
61–66	546 (48.3%)	20 (3.66%, 2.08–5.24)		12 (2.20%, 0.95–3.43)
67–72	685 (51.7%)	24 (3.50%, 2.12–4.88)		10 (1.71%, 0.66–2.76)
Total	1131 (100%)	44 (3.89%, 2.76–5.02)		22 (1.95%, 1.14–2.75)

N number, CI confidence interval
^aVectorial aniso-TA was defined as a difference of ≥0.5 in J₀ or J₄₅ between the two eyes
^bNon-vectoral aniso-TA was defined as the difference of ≥1.0 diopter cylinder in absolute cylinder between the two eyes regardless of axis

ISSN: 1471-2415