condition mean min max ZT0-3 6.0202275 5.26375 6.776705 ZT4-7 4.237025 4.237025 4.237025 ZT8-11 6.353495000000001 6.353495000000001 6.353495000000001 ZT12-15 0 0 0 ZT16-19 7.425965 7.425965 7.425965 ZT20-23 7.32092 7.32092 7.32092