condition mean min max ZT0-3 0.6651988333333333 0.2845625 1.0390424999999999 ZT4-7 0.36342050000000004 0.36342050000000004 0.36342050000000004 ZT8-11 0.9386000000000001 0.9386000000000001 0.9386000000000001 ZT12-15 0.73691175 0.70502 0.7688035 ZT16-19 1.422925 1.422925 1.422925 ZT20-23 0.899526 0.899526 0.899526