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Table 1 Baseline characteristics according to AHI level

From: The effect of surgical and non-surgical weight loss on N-terminal pro-B-type natriuretic peptide and its relation to obstructive sleep apnea and pulmonary function

Variable Low AHI (<15 events/hour) High AHI (≥15 events/hour) p
Number (n) 96 42  
Female gender (%) 76 (79) 20 (48) <0.001
Age (years) 43.0 (11.1) 48.2 (9.4) 0.009
BMI (kg/m2) 44.4 (5.0) 46.8 (6.6) 0.022
Surgical treatment (%) 50 (52) 26 (62) 0.353
Arterial blood gases
 pO2 (kPa) 11.8 (1.3) 10.7 (1.4) <0.001
 pCO2 (kPa) 5.1 (0.5) 5.5 (0.5) 0.001
Diffusing capacity
 DLCO (diffusing capacity for carbon monoxide) (% pred) 93 (13) 92 (17) 0.752
 DLCO/VA (diffusing capacity for CO/alveolar volume) (% pred) 106 (15) 111 (19) 0.135
Dynamic lung volumes
 FVC (forced vital capacity) (% pred) 104 (14) 98 (16) 0.055
 FEV1 (forced vital capacity first second) (% pred) 94 (15) 93 (20) 0.680
Static lung volumes
 TLC (total lung capacity) (% pred) 100 (13) 94 (13) 0.033
 IC (inspiratory capacity) (% pred) 123 (22) 115 (25) 0.098
 VC (vital capacity) (% pred) 100 (15) 96 (18) 0.136
 FRC (functional residual capacity) (% pred) 82 (17) 79 (16) 0.315
 ERV (expiratory reserve volume) (% pred) 48 (35) 49 (34) 0.885
 RV (residual volume) (% pred) 101 (28) 97 (27) 0.493
  1. Data are presented as mean (SD), or n (%), as appropriate