condition mean min max ZT0-3 4.222085 3.311165 5.133005 ZT4-7 3.56908 3.56908 3.56908 ZT8-11 2.8997849999999996 2.8997849999999996 2.8997849999999996 ZT12-15 0 0 0 ZT16-19 5.0456199999999995 5.0456199999999995 5.0456199999999995 ZT20-23 2.646445 2.646445 2.646445