Table 4. Aircrew examination indicators and CKD long-term predictions (n = 212).

Variable	Model 4		Model 5		Model 6
	OR (95% CI)	Adjusted OR (95% CI)a	OR (95% CI)	Adjusted OR (95% CI)a	OR (95% CI)	Adjusted OR (95% CI)a
Abnormal urobilinogen (vs normal)	3.13 (0.60–16.25)	2.77 (0.52–14.68)	1.21 (0.14–10.21)	1.08 (0.13–9.25)	6.07 (1.84–20.06)*	5.61 (1.57–20.09)*
Abnormal urine ketone (vs normal)	2.27 (0.54–13.85)	2.95 (0.57–15.25)	4.66 (1.10–19.70)*	5.00 (1.17–21.50)*	2.95 (0.88–9.95)	3.44 (0.99–12.04)
Occult blood in urine (vs normal)	13.31 (4.38–40.43)**	12.35 (4.02–37.94)**	4.59 (1.44–14.61)*	4.25 (1.32–13.70)*	3.93 (1.26–12.31)*	3.57 (1.11–11.50)*
Abnormal white blood cells in urine (vs normal)	N/A	N/A	1.63 (0.19–14.28)	1.72 (0.20–15.26)	4.66 (1.10–19.70)*	4.93 (1.15–21.14)*
High fasting blood glucose (vs normal)	0.64 (0.14–2.91)	0.78 (0.17–3.67)	0.60 (0.13–2.72)	0.70 (0.15–3.27)	0.58 (0.19–1.80)	0.65 (0.20–2.09)
Abnormal BUN (vs normal)	0.92 (0.11–7.53)	0.96 (0.12–7.95)	3.59 (0.89–14.52)	3.78 (0.92–15.49)	10.56 (1.40–79.47)*	11.07 (1.45–84.37)*
Abnormal serum creatinine (vs normal)	N/A	N/A	2.26 (0.45–11.27)	2.41 (0.48–12.17)	5.00 (0.43–57.73)	5.34 (0.45–63.10)
Abnormal uric acid (vs normal)	0.35 (0.10–1.25)	0.34 (0.10–1.22)	0.86 (0.32–2.34)	0.84 (0.31–2.29)	1.03 (0.36–2.98)	0.90 (0.31–2.63)
Abnormal LDL (vs normal)	1.21 (0.40–3.60)	1.05 (0.33–3.37)	1.46 (0.47–4.52)	1.12 (0.33–3.79)	2.50 (0.78–8.06)	2.31 (0.71–7.56)

^aAdjustment for age.

Model 4: used indicators from the first examination to predict the risk of CKD at the third examination.

Model 5: employed indicators from the first examination to predict the risk of CKD at the fourth examination.

Model 6: adopted indicators from the second examination to predict the risk of CKD at the fourth examination.

OR, odds ratio; CI, confidence interval; N/A, not applicable; ^*P < 0.05, ^**P < 0.01