condition mean min max ZT0-3 171.460075 171.460075 171.460075 ZT4-7 156.745844 156.745844 156.745844 ZT8-11 162.288946 162.288946 162.288946 ZT12-15 152.682234 152.682234 152.682234 ZT16-19 148.3076455 148.3076455 148.3076455 ZT20-23 181.101367 181.101367 181.101367