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Table 1 Participant characteristics

From: Plasma 25-hydroxyvitamin D level and the risk of frailty among Chinese community-based oldest-old: evidence from the CLHLS study

VariablesAll participants (n = 1324)Categories (nmol/L)Statistics a
Q1 (≤26.13)Q2 (26.13–35.89)Q3 (35.89–50.00)Q4 (> 50.00)
Socio-demographics, n (%)
 Age (80–112), M (SD)92.89 (7.92)95.63 (7.49)93.37 (7.72)91.85 (7.85)90.70 (7.78)25.207***
 Female844 (63.7)251 (75.8)236 (71.3)200 (60.2)157 (47.6)68.190***
 Married294 (22.3)44 (13.3)60 (18.2)83 (25.1)107 (32.7)40.503***
 Rural1124 (84.9)282 (85.2)282 (85.2)265 (79.8)295 (89.4)11.925**
 No schooling998 (76.4)279 (85.8)257 (78.4)242 (74.2)220 (67.1)33.410***
 With household member(s)950 (73.2)263 (82.2)236 (72.2)225 (69.7)226 (69.1)25.873***
Health characteristics, n (%)
 Smoking148 (11.3)28 (8.5)39 (11.8)37 (11.2)44 (13.5)4.337
 Drinking167 (12.7)32 (9.7)41 (12.5)45 (13.6)49 (14.9)0.218
 Regular exercise178 (13.9)27 (8.4)38 (11.9)54 (16.7)59 (18.6)17.317***
 Hypertension785 (62.2)197 (61.9)195 (62.1)192 (61.5)201 (63.0)0.155
 Diabetes mellitus98 (7.4)28 (8.5)25 (7.6)24 (7.3)21 (6.4)1.057
 Heart diseases91 (7.0)24 (7.4)24 (7.4)27 (8.4)16 (4.9)3.398
 Cerebrovascular diseases102 (7.8)34 (10.4)31 (9.5)18 (5.5)19 (5.8)8.630*
 Respiratory diseases116 (8.9)29 (9.0)32 (9.8)23 (7.0)32 (9.8)2.080
Biomarkers, M (IQR)
 CRP (mg/L)1.01 (0.41,2.93)1.12 (0.38,3.35)0.93 (0.43,3.05)0.96 (0.41,2.54)1.09 (0.39,2.75)1.491
 ALB (g/L)39.10 (35.90,42.40)37.90 (35.30,41.40)38.60 (35.48,42.12)39.70 (36.70,42.93)39.90 (37.20,42.80)29.923***
 CHO (mmol/L)4.16 (3.52,4.79)4.03 (3.49,4.72)4.21 (3.51,4.79)4.21 (3.47,4.97)4.20 (3.70,4.78)4.186
 CREA (mmol/L)78 (65,96)69 (60,85)77 (63,93)82 (69,98)87 (71,102)76.765***
 HDLC (mmol/L)1.23 (1.03,1.49)1.20 (1.01,1.45)1.25 (1.04,1.51)1.27 (1.03,1.55)1.23 (1.04,1.46)5.065
 LDLC (mmol/L)2.45 (1.94,3.02)2.40 (1.92,2.97)2.42 (1.89,3.05)2.41 (1.86,3.08)2.54 (2.04,3.00)5.147
 TG (mmol/L)0.79 (0.59,1.10)0.78 (0.59,1.07)0.79 (0.58,1.09)0.82 (0.61,1.16)0.77 (0.57,1.07)6.429
 SOD (IU/mL)58.53 (53.43,63.24)56.75 (51.75,62.97)58.18 (53.49,63.20)58.75 (53.33,63.06)59.39 (55.39,64.24)18.975***
 MDA (μmol/L)4.71 (3.73,5.79)4.81 (3.93,5.89)4.87 (3.88,5.91)4.84 (3.82,5.83)4.33 (3.25,5.55)27.303***
 WBC (109/L)5.30 (4.30,6.40)4.80 (4.00,6.00)5.10 (4.10,6.10)5.60 (4.57,6.60)5.60 (5.60,6.80)34.983***
 HGB (g/L)118 (106,131)121 (110,133)120 (107,132)116 (105,129)117 (105,131)11.618***
Frailty, n (%)426 (33.2)162 (48.9)112 (33.8)93 (28.0)59 (17.9)76.606***
  1. M (SD) mean (standard deviation), M (IQR) median (interquartile range)
  2. a Coefficient of ANOVA, Kruskal–Wallis test or χ2 test among categories of plasma 25(OH) D level
  3. * < 0.05, ** < 0.01, *** < 0.001
  4. Abbreviations: CRP C reactive protein, ALB plasma albumin, CHO total cholesterol, CREA plasma creatine, HDLC high-density lipoprotein cholesterol, LDLC low-density lipoprotein cholesterol, SOD superoxide dismutase, TG triglyceride, SOD superoxide dismutase, MDA malondialdehyde, WBC white blood cell count, HGB haemoglobin
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