condition mean min max ZT0-3 10.870093 10.870093 10.870093 ZT4-7 10.444391 10.444391 10.444391 ZT8-11 11.845082999999999 11.845082999999999 11.845082999999999 ZT12-15 12.073252499999999 12.073252499999999 12.073252499999999 ZT16-19 12.2075345 12.2075345 12.2075345 ZT20-23 10.459934 10.459934 10.459934