Table 3 Correlation between the dynamics changes of DD, PT, APTT, Fg, and the prognosis of COVID-19. Parameters Outcome at composite endpoint (n) Total Hospital discharge Improved Exacerbation Death DD1 (M ± SD) 0.87 ± 1.73 1.55 ± 3.93 6.51 ± 10.29 3.47 ± 7.41 1.97 ± 5.01  <0.55 38 18 4 5 65  0.55-1.11 3 6 0 6 15  >1.11 11 8 4 12 35  Total 52 32 8 23 115  χ2, P χ 2 = 20.82 P < 0.01  r, P r = 0.346 P < 0.01 DD2 (M ± SD) 1.62 ± 2.29 4.73 ± 8.02 12.40 ± 13.21 8.08 ± 10.96 4.50 ± 7.99  <0.55 20 5 0 1 26  0.55-1.11 12 11 0 1 24  >1.11 20 16 8 21 65  Total 52 32 8 23 115  χ2, P χ 2 = 30.11 P < 0.01  r, P r = 0.439 P < 0.01 DD3 (M ± SD) 1.27 ± 2.08 2.38 ± 4.27 6.22 ± 3.75 8.93 ± 10.91 3.40 ± 6.23  <0.55 26 11 0 2 39  0.55-1.10 11 9 0 0 20  >1.10 15 12 8 21 56  Total 52 32 8 23 115  χ2, P χ 2 = 36.86 P < 0.01  r, P r = 0.467 P < 0.01 PT1 (M ± SD) 11.91 ± 0.99 12.56 ± 1.84 13.41 ± 2.37 13.86 ± 3.68 12.59 ± 2.21  <9.2 0 0 0 0 0  9.20-15.0 52 31 6 18 107  >15 0 1 2 5 8  Total 52 32 8 23 115  χ2, P χ 2 = 16.403 P < 0.01  r, P r = 0.331 P < 0.01 PT2 (M ± SD) 12.97 ± 2.29 13.74 ± 4.28 14.23 ± 2.13 16.63 ± 5.06 14.00 ± 3.80  <9.2 0 0 0 0 0  9.20-15.0 50 28 5 13 96  >15 2 4 3 10 19  Total 52 32 8 23 115  χ2, P χ 2 = 21.104 P < 0.01  r, P r = 0.399 P < 0.01 PT3 (s) 12.72 ± 1.68 12.81 ± 2.45 16.56 ± 5.50 24.52 ± 15.20 15.37 ± 8.45  <9.2 0 0 0 0 0  9.20-15.0 50 30 5 5 90  >15 2 2 3 18 25  Total 52 32 8 23 115  χ2, P χ 2 = 58.66 P < 0.01  r, P r = 0.595 P < 0.01 APTT1 (M ± SD) 36.55 ± 8.75 34.95 ± 9.51 32.09 ± 5.27 35.53 ± 10.54 35.59 ± 9.13  <21.00 0 0 0 2 2  21.00-37.00 27 21 7 11 66  >37.00 25 11 1 10 47  Total 52 32 8 23 115  χ2, P χ 2 = 12.884 P < 0.05  r, P r = −0.131 P > 0.05 APTT2 (M ± SD) 28.56 ± 6.48 27.79 ± 4.93 27.66 ± 3.42 32.98 ± 8.53 29.17 ± 6.63  <21.00 1 1 0 0 2  21.00-37.00 48 29 8 19 104  >37.00 3 2 0 4 9  Total 52 32 8 23 115  χ2, P χ 2 = 4.857 P > 0.05  r, P r = 0.122 P > 0.05 APTT3 (M ± SD) 28.78 ± 4.18 27.07 ± 3.38 29.44 ± 4.92 40.40 ± 13.80 30.67 ± 8.58  <21.00 1 0 0 1 2  21.00-37.00 48 32 7 10 97  >37.00 3 0 1 12 16  Total 52 32 8 23 115  χ2, P χ 2 = 38.632 P < 0.01  r, P r = 0.359 P < 0.01 TT1  <10 0 0 1 0 1  10-20 51 32 7 20 110  >20 1 0 0 3 4  Total 52 32 8 23 115  χ2, P χ 2 = 21.510 P < 0.01  r, P r = 0.225 P < 0.05 TT2  <10 0 0 0 0 0  10-20 52 31 8 20 111  >20 0 1 0 3 4  Total 52 32 8 23 115  χ2, P χ 2 = 8.442 P < 0.05  r, P r = 0.167 P > 0.05 TT3  <10 0 0 0 0 0  10-20 51 32 8 20 111  >20 1 0 0 3 4  Total 52 32 8 23 115  χ2, P χ 2 = 8.084 P < 0.05  r, P r = 0.136 P > 0.05 Fg1 (M ± SD) 4.49 ± 1.29 4.81 ± 1.31 5.30 ± 1.44 4.39 ± 2.00 4.61 ± 1.48  <2.00 1 2 0 4 7  2.00-4.00 19 8 1 6 34  >4.00 32 22 7 13 74  Total 52 32 8 23 115  χ2, P χ 2 = 9.81 P > 0.05  r, P r = −0.02 P > 0.05 Fg2 (M ± SD) 3.55 ± 1.31 3.86 ± 1.32 3.84 ± 1.45 3.24 ± 1.80 3.60 ± 1.43  <2.00 3 1 1 8 13  2.00-4.00 35 20 3 9 67  >4.00 14 11 4 6 35  Total 52 32 8 23 115  χ2, P χ 2 = 18.92 P < 0.01  r, P r = −0.09 P > 0.05 Fg3 (M ± SD) 3.11 ± 1.03 3.96 ± 1.42 4.13 ± 2.49 3.24 ± 1.44 3.43 ± 1.41  <2.00 3 1 2 3 9  2.00-4.00 42 19 3 15 79  >4.00 7 12 3 5 27  Total 52 32 8 23 115  χ2, P χ 2 = 13.28 P < 0.05  r, P r = 0.07 P > 0.05 Normal reference values: DD (<0.55 mg/L); PT (9.20-15 sec); APTT (21.00-37.00 sec); TT (10-20 sec); Fg (2.00-4.00 g/L). ∗P value was calculated by a 2-sided test.