condition mean min max ZT0-3 191.75525 173.5405 209.97 ZT4-7 224.89249999999998 224.89249999999998 224.89249999999998 ZT8-11 240.0895 240.0895 240.0895 ZT12-15 0 0 0 ZT16-19 191.563 191.563 191.563 ZT20-23 222.2855 222.2855 222.2855