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Table 2 Characteristics of subjects in axial length subgroups (One-Way Analysis of Variance 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 Valuee
Normal (n = 238) Medium-long (n = 535) Long (n = 2665)
Age (years) 238 (66.2 ± 9.8) b 535 (63.9 ± 11.3) ** 2665 (61.5 ± 10.4) *** <  0.001
AL (mm) 238 (23.37 ± 0.64) 535 (25.90 ± 0.51) *** 2665 (29.54 ± 2.19) *** <  0.001
Q Value 195 (−0.14 ± 0.21) 451 (− 0.17 ± 0.16) * 2226 (− 0.20 ± 0.18) *** <  0.001
TCRP (D)
 Flat Meridian 203 (43.35 ± 1.19) 476 (42.92 ± 1.27) *** 2378 (42.77 ± 1.25) *** <  0.001
 Steep Meridian 203 (44.33 ± 1.18) 476 (43.91 ± 1.34) *** 2378 (43.87 ± 1.34) *** <  0.001
 Mean Value 203 (43.87 ± 1.14) 476 (43.44 ± 1.26) *** 2378 (43.34 ± 1.25) *** <  0.001
CA (D) 203 (0.98 ± 0.65) 476 (1.00 ± 0.67) 2378 (1.09 ± 0.70) * 0.005
Degree of CA
  < 1.5 D 163 (80.3) 378 (79.4) 1781 (74.9) 0.04
  ≥ 1.5 D c 40 (19.7) 98 (20.6) 597 (25.1)  
Axis of CA     0.18
 WTR 73 (36.0) 203 (42.7) 1028 (43.3)  
 ATR 93 (45.8) 177 (37.3) 886 (37.3)  
 OB 37 (18.2) 95 (20.0) 462 (19.4)  
WTW (mm) 150 (11.25 ± 0.36) 379 (11.43 ± 0.40) *** 1932 (11.43 ± 0.43) *** < 0.001
CT (μm)
 Central 197 (532.4 ± 30.6) 453 (541.1 ± 31.4) ** 2228 (541.5 ± 32.9) *** 0.001
 Temporal 196 (645.9 ± 38.5) 453 (661.4 ± 42.4) *** 2219 (669.7 ± 46.3) *** < 0.001
 Nasal 182 (696.0 ± 45.6) 426 (697.1 ± 44.2) 2152 (688.5 ± 46.8) * 0.001
ACD (mm) 197 (2.52 ± 0.42) 460 (2.80 ± 0.46) *** 2278 (2.96 ± 0.49) *** <  0.001
IOP (mmHg) 217 (14.7 ± 3.0) 449 (14.8 ± 3.2) 2323 (15.4 ± 3.4) ** < 0.001
Scale of IOP     0.002
  < 21 mmHg 214 (98.6) 437 (97.3) 2196 (94.5) **  
  ≥ 21 mmHg d 3 (1.4) 12 (2.7) 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. *P < 0.05, **P < 0.01, and ***P < 0.001 (two-tailed). The P values were from post hoc comparisons with the normal subgroup
  3. aThe division of AL subgroups: normal, 21.50 ≤ AL < 24.50 mm; medium-long, 24.50 ≤ AL < 26.50 mm; long, AL ≥26.50 mm
  4. 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)
  5. cIndication for toric intraocular lens implantation during cataract surgery
  6. dOcular hypertension
  7. eThe P values were from one-way analysis of variance and Pearson’s χ2 test