condition mean min max ZT0-3 7.18 7.0331399999999995 7.32686 ZT4-7 5.708165 5.708165 5.708165 ZT8-11 5.976694999999999 5.976694999999999 5.976694999999999 ZT12-15 0 0 0 ZT16-19 9.12678 9.12678 9.12678 ZT20-23 8.601054999999999 8.601054999999999 8.601054999999999