condition mean min max ZT0-3 5.3615375 5.12016 5.602914999999999 ZT4-7 3.253905 3.253905 3.253905 ZT8-11 5.418215 5.418215 5.418215 ZT12-15 0 0 0 ZT16-19 7.21438 7.21438 7.21438 ZT20-23 6.1499749999999995 6.1499749999999995 6.1499749999999995