condition mean min max ZT0-3 0.2484520835 0.0 0.496904167 ZT4-7 4.32427430875 2.630224037 6.0183245805 ZT8-11 9.385789680750001 8.2626740865 10.508905275 ZT12-15 14.766980935 12.00685034 17.52711153 ZT16-19 10.7765648675 10.62490801 10.928221725 ZT20-23 7.653721528249999 5.5436662905 9.763776766