condition mean min max ZT0-3 263.85 263.85 263.85 ZT4-7 87.4 87.4 87.4 ZT8-11 155.14999999999998 155.14999999999998 155.14999999999998 ZT12-15 156.8 156.8 156.8 ZT16-19 278.8 278.8 278.8 ZT20-23 325.35 325.35 325.35