condition mean min max ZT0-3 932.523325 932.523325 932.523325 ZT4-7 351.47769600000004 351.47769600000004 351.47769600000004 ZT8-11 261.06588450000004 261.06588450000004 261.06588450000004 ZT12-15 290.2821205 290.2821205 290.2821205 ZT16-19 501.4415245 501.4415245 501.4415245 ZT20-23 660.049707 660.049707 660.049707