condition mean min max ZT0-3 32.394275 24.1486 40.63995 ZT4-7 12.275545000000001 12.275545000000001 12.275545000000001 ZT8-11 20.43025 20.43025 20.43025 ZT12-15 0 0 0 ZT16-19 24.001345 24.001345 24.001345 ZT20-23 24.1243 24.1243 24.1243