condition mean min max ZT0-3 138.182615 138.182615 138.182615 ZT4-7 216.926109 216.926109 216.926109 ZT8-11 227.73517500000003 227.73517500000003 227.73517500000003 ZT12-15 253.313075 253.313075 253.313075 ZT16-19 141.9632215 141.9632215 141.9632215 ZT20-23 145.729944 145.729944 145.729944