condition mean min max ZT0-3 15.572972 15.572972 15.572972 ZT4-7 16.262842 16.262842 16.262842 ZT8-11 17.621895000000002 17.621895000000002 17.621895000000002 ZT12-15 16.356409 16.356409 16.356409 ZT16-19 12.859331000000001 12.859331000000001 12.859331000000001 ZT20-23 13.303519999999999 13.303519999999999 13.303519999999999