81.54 Percentage of reviews struck down in this Test series, the second-highest percentage among the 26 Test series with at least 25 reviews since September 2017. Only 12 of the 65 DRS reviews by India and England got upheld across the four matches. Of the 65 DRS reviews in this series, 31 alone were against Nitin Menon, easily the most for an umpire during a Test series in the past four years.
46.6 Bowling strike rate during this Test series, the best in a Test series of four-plus matches. The Indian bowlers bagged 80 wickets at a strike rate of 42, while the visitors took 58 wickets at 52.8.
0 Instances of a player being the lone centurion and the only player to claim five-plus wicket haul(s) for his team in a four-plus match Test series before Joe Root did it against India in this series. Root scored England's only individual century of the series, and also accounted for the only five-wicket haul by the visitors.
104 Wickets taken by spin bowlers in this Test series are the third-most number of wickets claimed by spinners in a Test series. The five-match Test series between India and England in 1972-73 saw as many as 109 wickets claimed by spinners, while 108 wickets went to spin bowlers during the India and England series in 2016.
67 Wickets for the Indian spinners during this series, the most for any team's spinners in a four-match Test series. India surpassed their record of 65 wickets during the Border-Gavaskar Trophy at home in 2013.
4 Number of fifty-plus partnerships for the first three wickets in this series, the second-fewest number of fifty-plus stands among the 220 Test series with 40-plus partnerships for the first three wickets . West Indies' tour of New Zealand in 1955-56 had only three fifty-plus stands across 41 partnerships for the first three wickets.
19.83 Average runs per wicket in this Test series for England, the third-lowest by them in a four-plus match Test series . The England team averaged only 19.11 in the four-match Test series during the West Indies tour in 1934-35, and only 19.1 in the five-match series in South Africa in 1905-06.
31 Number of ducks across four matches in this series, the most ducks in a four-match Test series. The record was previously held by England vs Pakistan series in 2010 with 29 ducks.
Sampath Bandarupalli is a statistician at ESPNcricinfo