condition mean min max ZT0-3 1.8623425 1.332085 2.3926 ZT4-7 1.1098245 1.1098245 1.1098245 ZT8-11 1.18546 1.18546 1.18546 ZT12-15 0 0 0 ZT16-19 1.8629250000000002 1.8629250000000002 1.8629250000000002 ZT20-23 1.87113 1.87113 1.87113