condition mean min max ZT0-3 29.814186666666668 11.31821 42.588750000000005 ZT4-7 11.212 11.212 11.212 ZT8-11 12.37145 12.37145 12.37145 ZT12-15 13.60106 10.88152 16.3206 ZT16-19 20.90215 20.90215 20.90215 ZT20-23 36.6558 36.6558 36.6558