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. 2020 Oct 29;53(4):690–700. doi: 10.1111/evj.13345

Table 2.

The age (mean and SD range), sex, glycogen synthase 1 (GYS1) mutation status, muscle biopsied, number of horses with PAS‐positive aggregates and the number with four or more fibres with desmin aggregates for Warmblood (WB) and Arabian (AR) horse controls and those diagnosed with type 2 polysaccharide storage myopathy and myofibrillar myopathy

Warmblood Arabian
Control PSSM2/MFM Control PSSM2/MFM
N 54 68 30 30

Age (y)

Range

8.6 ± 4.3

2‐24

9.7 ± 4.6

3‐28

12.4 ± 5.9

4‐23

13.9 ± 5.7

4‐29

Sex 20 f, 33 mc, 1 s 23 f, 42 mc, 2 s, 1 un 22 f, 8 mc 18 f, 12 mc
GYS1 mutation neg neg nd 13 neg, 17 nd
Muscle biopsied 29 glut, 34 sm 18 glut 50 sm 30 glut 17 glut, 13 sm
Horses with PAS aggregates 0 55 0 18
Horses with desmin aggregates 0 37 0 30

Abbreviations: AR, Arabian; f, female; Glut, gluteus medius; GYS1, glycogen synthase 1; mc, male castrate; MFM, Myofibrillar Myopath; nd, not done; neg, negative; PAS, periodic acid‐Schiff's; PSSM2, Polysaccharide storage myopathy type 2; s, stallion; Sm, semimembranosus; un, unknown; WB, Warmblood.