Table 2 Association of mean monthly cumulative incidence of subclinical ketosis with different risk factors based on univariate and multivariate binary logistic regression analysis

Study year

2019

1699

4.09 (3.29, 5.20)

< 0.0001

3.75 (3.00, 4.70)

< 0.0001

2020

1763

2.23 (1.77, 2.82)

< 0.0001

2.10 (1.66, 2.66)

< 0.0001

2021

1983

1

-

1

-

2022

2066

1.20 (0.94, 1.54)

0.153

1.33 (1.04, 1.72)

0.026

Season

Summer

1942

1.13 (0.91, 1.39)

0.267

1.12 (0.90, 1.39)

0.309

Autumn

2119

1

-

1

-

Winter

1706

2.08 (1.71, 2.53)

< 0.0001

1.90 (1.55, 2.32)

< 0.0001

Spring

1744

1.08 (0.87, 1.35)

0.483

0.97 (0.77, 1.21)

0.773

Parity

Parity 1

2819

1

-

1

-

Parity 2

2238

1.15 (0.93, 1.42)

0.190

1.18 (0.95, 1.46)

0.133

Parity 3

1134

2.78 (2.25, 3.44)

< 0.0001

2.30 (1.86, 2.86)

< 0.0001

Parity 4

671

3.55 (2.81, 4.49)

< 0.0001

3.19 (2.51, 4.06)

< 0.0001

Parity 5

326

3.49 (2.57, 4.73)

< 0.0001

3.49 (2.55, 4.77)

< 0.0001

Parity 6

182

2.93 (1.96, 4.39)

< 0.0001

2.63 (1.74, 3.97)

< 0.0001

Parity 7

141

2.32 (1.43, 3.77)

0.001

2.36 (1.43, 3.88)

0.001