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Table 2 Descriptive statistics (frequencies (%), or medians with inter-quartile ranges within parenthesis) for cows classified as repeat breeder (RB+) and not repeat breeder (RB-)a.

From: Characterisation of the Repeat Breeding Syndrome in Swedish Dairy Cattle

Variable RB+ (n = 3,436) RB- (n = 34,051)
Breed:   
   Swedish Red and White Cattle 1,973 18,976
   Swedish Fresian Cattle 1,299 13,179
   Other or cross-bred 164 1,896
FCM23b 28.4 (24.7–32.8) 28.0 (24.1–32.2)
Lactation number:   
   1 1,299 12,420
   2 892 9,300
   3+ 1,245 12,331
Parturition :   
   Normal or not known 3,211 32,357
   Difficult or dystocia 159 1,065
   Twins (normal parturition) 66 629
Stillbirth:   
   No 3,261 32,677
   Yes 175 1374
Season at 1st service:   
   January 439 3,293
   February-March 666 6,263
   April-September 701 9,282
   October-December 1,630 15,213
RB in previous lactation:   
   No 2,916 28,802
   Yes 194 1,255
   not known 326 3,994
Days in milk at 1st service 68 (58–83) 75 (63–93)
Veterinary treatedc cases of:   
   Clinical mastitis 5.5 7.1
   Reproductive disorder 4.5 3.8
   Digestive disorder 6.7 6.6
   Other disorder 0.9 0.8
  1. a The sum of number of cows is less than the total (57,616) since only cows with at least one AI were at risk for RB and some had missing information on explanatory variables
  2. b Average of daily fat-corrected milk yield recorded at 2nd and 3rd official test-month after calving
  3. c Only treatments occurring before 1st service