condition mean min max ZT0-3 4.0700588907499995 2.0149005769999997 6.1252172045 ZT4-7 3.0018582085000003 1.708359468 4.295356949 ZT8-11 8.4543599745 4.103909074 12.804810875000001 ZT12-15 29.839060699999997 22.56204052 37.11608088 ZT16-19 34.22064097 30.99157345 37.44970849 ZT20-23 51.375744337499995 49.242947655 53.508541019999996