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Table 3 Characteristics of Subjects with and without High Axial Myopia (Student’s t Test and Pearson’s χ2 Test)

From: Associations between anterior segment biometry and high axial myopia in 3438 cataractous eyes in the Chinese population

Characteristics AL (Group) a P Value
Non-Highly Axial Myopia (n = 773) Highly Axial Myopia (n = 2665)
Age (years) 773 (64.6 ± 10.9) b 2665 (61.5 ± 10.4) <  0.001
AL (mm) 773 (25.12 ± 1.29) 2665 (29.54 ± 2.19) < 0.001
Q Value 646 (−0.16 ± 0.18) 2226 (− 0.20 ± 0.18) < 0.001
TCRP (D)
 Flat Meridian 679 (43.05 ± 1.26) 2378 (42.77 ± 1.25) < 0.001
 Steep Meridian 679 (44.04 ± 1.31) 2378 (43.87 ± 1.34) 0.003
 Mean Value 679 (43.56 ± 1.24) 2378 (43.34 ± 1.25) < 0.001
CA (D) 679 (0.99 ± 0.66) 2378 (1.09 ± 0.70) 0.001
Degree of CA
  < 1.5 D 541 (79.7) 1781 (74.9) 0.01
  ≥ 1.5 D c 138 (20.3) 597 (25.1)  
Axis of CA    0.43
 WTR 276 (40.7) 1028 (43.3)  
 ATR 270 (39.8) 886 (37.3)  
 OB 132 (19.5) 462 (19.4)  
WTW (mm) 529 (11.38 ± 0.39) 1932 (11.43 ± 0.43) 0.03
CT (μm)
 Central 650 (538.4 ± 31.4) 2228 (541.5 ± 32.9) 0.04
 Temporal 649 (656.7 ± 41.9) 2219 (669.7 ± 46.3) < 0.001
 Nasal 608 (696.8 ± 44.6) 2152 (688.5 ± 46.8) <  0.001
ACD (mm) 657 (2.72 ± 0.47) 2278 (2.96 ± 0.49) <  0.001
IOP (mmHg) 666 (14.8 ± 3.1) 2323 (15.4 ± 3.4) <  0.001
Scale of IOP    0.001
  < 21 mmHg 651 (97.7) 2196 (94.5)  
  ≥ 21 mmHg d 15 (2.3) 127 (5.5)  
  1. Abbreviations: ACD Anterior chamber depth, AL Axial length, ATR Against-the-rule astigmatism, CA Corneal astigmatism, CT Corneal thickness, D Diopter, IOP Intraocular pressure, OB Oblique astigmatism, Q Corneal asphericity coefficient, TCRP Total corneal refractive power, WTR With-the-rule astigmatism, WTW White-to-white corneal diameter
  2. aThe division of AL subgroups: non-highly axial myopia, 21.50 ≤ AL < 26.5 mm; highly axial myopia, AL ≥26.50 mm
  3. bFor quantitative variables, the values are expressed as the number of eyes (mean ± standard deviation); for qualitative variables, the values are expressed as the number of eyes (proportion)
  4. cIndication for toric intraocular lens implantation during cataract surgery
  5. dOcular hypertension