condition mean min max ZT0-3 12.082827080000001 11.73594209 12.42971207 ZT4-7 13.71533831 11.072555685000001 16.358120935 ZT8-11 23.8567223125 21.449940820000002 26.263503805 ZT12-15 12.652801515499998 7.5232288315 17.782374199499998 ZT16-19 6.85083892 6.806246783000001 6.895431057 ZT20-23 6.631013843 6.206647809000001 7.055379877