condition mean min max ZT0-3 9.778898 9.778898 9.778898 ZT4-7 20.180477500000002 20.180477500000002 20.180477500000002 ZT8-11 17.6734145 17.6734145 17.6734145 ZT12-15 11.7194055 11.7194055 11.7194055 ZT16-19 9.773063 9.773063 9.773063 ZT20-23 13.0752405 13.0752405 13.0752405