condition mean min max ZT0-3 3.8227675 3.3258 4.319735 ZT4-7 3.33459 3.33459 3.33459 ZT8-11 5.623055000000001 5.623055000000001 5.623055000000001 ZT12-15 0 0 0 ZT16-19 3.977905 3.977905 3.977905 ZT20-23 2.42065 2.42065 2.42065