condition mean min max ZT0-3 12.990727 12.990727 12.990727 ZT4-7 13.228902999999999 13.228902999999999 13.228902999999999 ZT8-11 11.701202 11.701202 11.701202 ZT12-15 12.357831000000001 12.357831000000001 12.357831000000001 ZT16-19 13.2439415 13.2439415 13.2439415 ZT20-23 14.39989 14.39989 14.39989