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. Author manuscript; available in PMC: 2015 May 15.
Published in final edited form as: Pediatr Res. 2012 Oct 4;72(6):606–612. doi: 10.1038/pr.2012.132

Figure 6.

Figure 6

Wavelet analysis of the SpO2 waveform. At the higher frequencies levels, A) D1: 0.125–0.250Hz, B) D2: 0.063–0.125Hz, and C) D3: 0.031–0.063hz, the severe ROP infant group had significantly lower spectral power from 21–49 days of life at level D1 (p<0.05) and ≥14 days of life at levels D2 and D3 (all p<0.05). There were no differences between groups at mid frequencies D) D4: 0.016–0.031Hz, and E) D5: 0.008–0.016Hz. At the two lowest frequency levels F) D6: 0.004–0.008Hz and G) D7: 0.002–0.004Hz) there was a shift towards a significantly higher spectral power in the severe ROP group from 21 to 28 days of life at level D6 (p<0.05) and from 21 to 35 days of life at D7 (p<0.05). open circle, No or Mild ROP, black square, Severe ROP, solid line, covariate adjusted models. m±SEM.