## Table 4 |
|||||||

Slow spindle percentage in OSA according to topography and night sections |
|||||||

Total |
Non-OSA |
Mild OSA |
Mod OSA |
Chi-square |
df |
||

(28) |
(7) |
(11) |
(10) |
||||

Location | Night Section | ||||||

Frontal | total^{∗∗∗} |
72.3 | 66.4 | 71.0 | 78.8^{c,f} |
39,623 | 2 |

I | 72.1 | 68.3 | 71.2 | 76.1 | 6,041 | 2 | |

II^{∗∗} |
75.6 | 75.2 | 70.8 | 81.3^{c} |
12,242 | 2 | |

III^{∗∗∗} |
69.0 | 57.7 | 70.9^{c} |
79.2^{a,f} |
33,613 | 2 | |

Central | total^{∗∗∗} |
47.7 | 32.6 | 45.7^{c} |
61.7^{c,f} |
192,429 | 2 |

I^{∗∗∗} |
53.1 | 41.4 | 48.6 | 65.7^{c,f} |
50,435 | 2 | |

II^{∗∗∗} |
43.8 | 26.7 | 42.3^{c} |
55.9^{c,f} |
63,836 | 2 | |

III^{∗∗∗} |
46.4 | 29.5 | 46.3^{c} |
64.1^{c,f} |
86,224 | 2 | |

Parietal | total^{∗∗∗} |
32.6 | 17.9 | 29.9^{c} |
50.9^{c,f} |
297,793 | 2 |

I^{∗∗∗} |
38.9 | 23.2 | 34.7^{c} |
57.4^{c,f} |
101,732 | 2 | |

II^{∗∗∗} |
27.0 | 17.4 | 22.8 | 41.9^{c,f} |
71,609 | 2 | |

III^{∗∗∗} |
32.4 | 13.3 | 32.7^{c} |
54.1^{c,f} |
133,466 | 2 |

Mod, moderate; df, degrees of freedom; Location, scalp EEG topography; total, (I+II+III)
sample; I, II and III, initial, middle and final night sections, respectively. P-value
significance as follows: ^{∗}<0.05, ^{∗∗}<0.01, ^{∗∗∗}<0.001. Significance of post-hoc inter-group comparisons (with Bonferroni correction
for multiple comparisons) as follows: *a*<0.05, *b*<0.01, *c*<0.001 for contiguous comparisons; *d*<0.05, *e*<0.01, *f*<0.001 for non-contiguous comparisons.

Schönwald * et al.*

Schönwald * et al.* *BMC Neuroscience* 2012 **13**:89 doi:10.1186/1471-2202-13-89