condition mean min max ZT0-3 101.384573 101.384573 101.384573 ZT4-7 134.2583245 134.2583245 134.2583245 ZT8-11 192.401014 192.401014 192.401014 ZT12-15 178.51558649999998 178.51558649999998 178.51558649999998 ZT16-19 200.77837 200.77837 200.77837 ZT20-23 195.153019 195.153019 195.153019