condition mean min max ZT0-3 0.2836535 0.2836535 0.2836535 ZT4-7 0.286428 0.286428 0.286428 ZT8-11 0.24091200000000002 0.24091200000000002 0.24091200000000002 ZT12-15 0.20813225 0.20813225 0.20813225 ZT16-19 0.40051400000000004 0.40051400000000004 0.40051400000000004 ZT20-23 0.2599905 0.2599905 0.2599905