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Table 2 Coefficient of variation (CV) of parameters

From: An automated system for quantitative analysis of Drosophila larval locomotion

Parameter Animal-to-animal variation Day-to-day variation
n = 623 n = 54
Mean ± S.D. CV (%) Mean ± S.D. CV (%)
Animal shape
Body Length 4.34 ± 0.35 8.2 4.33 ± 0.26 6.1
Body Length Contracted 4.12 ± 0.34 8.3 4.12 ± 0.26 6.3
Body Length Extended 4.63 ± 0.38 8.2 4.62 ± 0.27 5.9
Time Head Bending 0.01 ± 0.01 107.3 0.01 ± 0 37.9
Time Body Bending 0.1 ± 0.07 67.8 0.1 ± 0.03 25.6
Time Bending 0.11 ± 0.07 65.9 0.11 ± 0.03 24.6
Peristalsis movement
Speed 0.62 ± 0.2 32.9 0.62 ± 0.15 24.7
Time Striding 0.76 ± 0.13 16.7 0.76 ± 0.05 6.7
Speed Striding 0.62 ± 0.19 30.4 0.62 ± 0.14 22.7
Stride Duration 1.61 ± 0.38 23.4 1.61 ± 0.24 14.9
Stride Distance 0.89 ± 0.16 18.4 0.89 ± 0.12 13.0
Contraction Rate 0.69 ± 0.14 20.9 0.69 ± 0.08 12.2
Extension Rate 0.82 ± 0.19 22.4 0.82 ± 0.11 13.4
Stamina
Stride Count 29.91 ± 8.46 28.3 29.89 ± 5.12 17.1
Run Distance 13.92 ± 8.95 64.3 13.88 ± 4.66 33.6
Run Duration 23.53 ± 14.78 62.8 23.48 ± 7.06 30.1
Run Stride Count 14.8 ± 8.83 59.6 14.77 ± 4.17 28.2
Run Count 2.25 ± 0.93 41.4 2.25 ± 0.44 19.4
Track
Distance 33.55 ± 10.77 32.1 33.49 ± 8.07 24.1
Direction Change 0.25 ± 0.14 56.2 0.25 ± 0.06 23.5
Time Inside 0.61 ± 0.24 39.0 0.61 ± 0.12 20.0
  1. Animal-to-animal variations: each data point is an animal; n is the number of animals, pooled from all experimental dates. Day-to-day variation: each data point is the mean value from animals tracked on the same day; n is the number of dates. S.D., standard deviation. Bold text, coefficient of variation (CV) <50%.