TABLE 2

Clinical, sleep and physical activity in daily life according to sleep quantity

Variables≤7 h
n=12
7 to 9 h
n=31
≥9 h
n=12
p-value
Male sex n (%)6 (50)16 (52)6 (50)
Age years64 (60–69)66 (60–75)72 (65–75)0.313
FEV1 %pred57 (50–68)55 (40–62)41 (43–60)0.128
mMRC2 (1–3)3 (1–3)3 (2–3)0.172
HADS anxiety score5 (1–7)5 (2–7)6 (1–7)0.948
HADS depression score4 (1–6)3 (1–4)6 (4–8)0.092
BMI kg·m−224 (21–34)25 (22–29)28 (24–31)0.553
FFMI kg·m−219.7 (18.7–21.9)19.4 (18.0–21.5)20.1 (17.5–22.2)0.784
FMI kg·m−25.5 (2.9–5.5)5.0 (3.2–7.5)7.4 (4.1–9.2)0.423
6MWT m531 (461–567)490 (439–521)413 (364–440)#,¶<0.0001
Sleep characteristics
 TIB min390 (374–408)487 (448–513)#596 (569–618)#,¶<0.0001
 TST min270 (212–309)354 (298–382)#382 (345–445)#0.001
 Sleep efficiency %72 (61–77)72 (65–78)65 (59–71)0.225
 Sleeping bouts n6.3 (5.6–6.9)6.9 (5.7–8.1)8.2 (6.7–14.3)#0.024
 Sleeping bouts duration min46 (36–63)54 (40–70)45 (28–71)0.429
 WASO min106 (84–156)117 (75–167)195 (147–218)#,¶0.006
PADL characteristics
 Awake time min1017 (993–1036)890 (850–934)#785 (718–810)#,¶<0.0001
 Time spent in SB min533 (426–694)514 (383–649)599 (490–629)0.546
 Time spent in SB %Tawake55.0 (42.2–67.6)56.9 (40.2–68.3)77.3 (65.7–86.8)#,¶0.017
 Time spent in LIPA min371 (275–428)300 (215–414)170 (93–245)#,¶0.001
 Time spent in LIPA %Tawake35.2 (27.8–42.9)35.3 (23.7–46.4)21.1 (12.3–32.4)#,¶0.025
 Time spent in MVPA min85 (36–156)45 (10–89)8 (2–16)#,¶0.001
 Time spent in MVPA %Tawake8.4 (3.7–15.9)5.5 (1.1–10.5)0.99 (0.3–2.2)#,¶0.003
 Steps·day−1 n8945 (6746–11956)8424 (4068–10481)3018 (1768–4586)#,¶<0.0001
 Total energy expenditure·day−1 kcal1738 (1518–2111)1562 (1218–1655)1004 (892–1333)#,¶<0.0001
 Average MET·day−11.8 (1.5–1.9)1.6 (1.4–1.9)1.3 (1.3–1.4)#,¶0.003

Data are presented as median (interquartile range), unless otherwise stated. FEV1: forced expiratory volume in the first second; mMRC: modified Medical Research Council; HADS: Hospital Anxiety and Depression Scale; BMI: body mass index; FFMI: fat-free mass index; FMI: fat mass index; 6MWT: 6-min walking test; TIB: total time in bed; TST: total sleep time; WASO: wake-after-sleep onset; PADL: physical activity in daily life; SB: sedentary behaviour; LIPA: light intensity physical activity; MVPA: moderate-to-vigorous physical activity; Tawake: time spent awake; MET: metabolic equivalents of task. #: p<0.05 versus ≤7 h; : p<0.05 versus 7 to 9 h.