Table 3

Comparison of patient characteristics with excellent or poor final surgical outcome

Excellent (motor+sensory) n=19–24*Poor (motor+sensory) n=21–26*p Value†
Demographic characteristics
 % male, % female33, 6750, 50p=0.23
 Mean (SD) age at surgery (years)4.3 (1.7)4.3 (1.9)p=0.98
Mean diff −0.01; 95% CI −1.07 to 1.05
 Mean (SD) duration of X(T) (months)40.4 (20.6)39.1 (20.9)p=0.83
Mean diff 1.3; 95% CI −10.7 to 13.2
Preoperative characteristics
 Median (IQR) near angle20 (14–25)20 (12–30)p=0.98
 Median (IQR) distance angle35 (25–40)30 (30–40)p=0.66
 Median (IQR) log transformed near stereo1.93 (1.74–2.23)2.04 (1.93–2.28)p=0.28
 Mean (SD) visual acuity0.114(.092)0.153(.118)p=0.23
Mean diff −0.039; 95% CI −0.103 to 0.026
 Median (IQR) NCS6 (5–7)6 (4.5–7.5)p=0.74
 Had prior treatment for control5/24 (21%)7/26 (27%)p=0.61
Surgical characteristics
 Type of surgery
  Unilateral54% (13/24)73% (19/26)p=0.16
  Bilateral46% (11/24)27% (7/26)
 Surgical dose
  Mean (SD) amount of bilateral surgery (mm) per PD0.49 (0.13)0.42 (0.05)p=0.22
Mean diff 0.07; 95% CI −0.05 to 0.19
  Mean (SD) amount of unilateral surgery (mm) per PD0.30 (0.04)0.34 (0.06)p=0.08
Mean diff −0.04; 95% CI −0.08 to 0.01
Post-operative characteristics
 Initial motor alignment
  Excellent38% (8/21)16% (4/25)p=0.18
  Fair29% (6/21)28% (7/25)
  Poor33% (7/21)56% (14/25)
 Initially corrected (NCS 0)7/24 (29%)4/26 (15%)p=0.24
 Initially over-corrected10/24 (42%)7/26 (27%)p=0.27
 Had further surgery or botulinum toxin injection5/24 (21%)3/26 (12%)p=0.37
 Had postoperative non-surgical treatment3/24 (12%)6/26 (23%)p=0.33
  • *Motor and sensory data available for a total of 69/72 patients: 24 excellent, 19 fair, 26 poor. Range given is for number of cases in the excellent and poor groups, except near stereo which excludes children aged <4 years at pre-op assessment.

  • †Independent t-test for comparison of means; Mann-Whitney for comparison of medians; χ2 test for nominal data.

  • NCS, Newcastle Control Score; PD, prism dioptres.